Key Won't Turn in the Lock: What to Do

A stiff or seized lock is rarely random. There is almost always an underlying reason, and knowing which one you are dealing with shapes what you should do next. The most common culprit in older properties — particularly the Victorian and Edwardian terraces you find around Slough town centre and the streets off the High Street — is a worn or tired lock cylinder. Cylinders accumulate years of metal-on-metal wear, and eventually the internal pins simply stop aligning cleanly when the key is inserted. The key looks correct, it fits, but the mechanism will not co-operate.

A second common cause is a dropped or sagging door. When a door drops even a few millimetres on its hinges — something that happens gradually with heavy uPVC and composite front doors — the latch or the deadlock bolt is no longer centred in the keep on the frame. The door is under stress, squeezing the lock mechanism, and the key cannot do its job. You may also notice a small gap at the top of the door or difficulty pushing the door fully shut. Debris is a third cause: grit, dust, old lubricant residue and even tiny fragments of metal can clog a cylinder over time, particularly in a letterbox-adjacent lock that is exposed to draughts. Finally, the key itself may be to blame — a bent, worn or poorly cut key will gradually stop working, often intermittently at first, before failing altogether.

The most important word here is gently. A surprising number of broken keys and damaged cylinders are caused not by the original fault, but by the homeowner applying firm force in frustration. Before you try anything, make sure you are using the correct key — not an older one from before the last lock change Slough properties sometimes see when tenants move on. Check the key for any visible bend or damage. If the key looks fine, try these steps in order.

First, try repositioning the door. If a dropped door is squeezing the bolt, lifting the handle firmly upward while simultaneously turning the key can release just enough pressure for the cylinder to turn. This works surprisingly often with uPVC multipoint locks, where the door weight can cause the whole mechanism to bind. Second, apply a small amount of graphite-based lubricant or a PTFE dry spray to the key and work it gently into the cylinder — do not use WD-40, which can attract dirt and gum up the mechanism over time. Insert and withdraw the key a few times before attempting to turn it. Third, make sure the lock is not in a double-locked position; some mortice deadlocks and multipoint locks have a secondary locked mode that requires a different key action to release. If none of these steps work after one or two calm attempts, stop. You have done what is safely possible without specialist tools.

It is natural to want to keep trying, but this is the point where many homeowners accidentally turn a repairable lock into a replacement job. A key that is twisted beyond its tolerances will snap, and a snapped key inside a cylinder is a separate extraction job on top of whatever was wrong in the first place. Similarly, applying lateral force to a stiff euro cylinder — the type found in most modern uPVC and composite doors — can cause the cylinder to shear. Euro cylinders that are not anti-snap rated will fail in a way that leaves the door either permanently locked or, in some cases, permanently unlocked, which is a security risk either way.

If you are locked out of your house and cannot get the key to turn, do not attempt to lever the door, remove hinges, or probe the lock with any object other than the correct key. These approaches risk damaging the door frame, the door itself, or the lock in ways that dramatically increase the cost of putting things right. What to do if locked out of your house is a question we answer every single day across Slough and the surrounding postcodes — SL1, SL2, SL3, Windsor and beyond. The right answer is always to verify there is no accessible window you have deliberately left on the latch, check with a trusted neighbour who may hold a spare key, and if neither applies, call a professional. For immediate help, call Langley Locksmith on 01753 251949 — we are available 24 hours a day, every day of the year, and we will usually have a locksmith with you in around 30 minutes.

When you call us — whether it is 2pm on a Tuesday or midnight on a bank holiday — we take a few quick details over the phone: your location, the type of door you have if you know it, and the nature of the problem. We will confirm an exact price before anyone travels to you. That price will depend on factors such as the type of lock and door involved, the time of day, travel distance, and whether parts such as a new cylinder are needed. There are no surprises when we arrive.

A skilled locksmith will assess the situation before touching anything. For a standard entry — where the goal is to get you back into your home without unnecessary damage — a trained technician has techniques and tools that bear no resemblance to anything a homeowner should attempt. We work with the lock, not against it. Once entry is made, we will show you exactly what caused the problem. If the cylinder is worn, cracked or a standard euro cylinder that lacks anti-snap protection, we will explain your options clearly. Many of our Slough customers take the opportunity at that point to arrange a door lock replacement Slough-wide that also upgrades their security — moving to a TS007 3-star anti-snap cylinder that many home insurers now recommend. We carry stock of quality cylinders and can often complete the upgrade on the same visit.

Sometimes a stiff key is an early warning sign rather than an isolated fault. If your lock has been difficult on and off for a few months, if the door is an older one with a 2-lever mortice rather than the BS3621 5-lever that most insurers require, or if you have recently moved into a property in Slough and do not know how many copies of the key exist, a lock change is worth considering seriously. UPVC door lock repair Slough is another common job we handle — the multipoint mechanisms in uPVC doors have multiple gearboxes and locking points that wear independently, and sometimes only one component needs replacing rather than the entire door furniture.

For landlords, letting agents and housing association properties across the Slough area, changing the lock between tenancies is simply good practice. We work with managing agents and individual landlords regularly, often attending on short notice when a tenant has moved out and a new one is moving in. Whether you need a straightforward cylinder swap on a Yale-type nightlatch, a full 5-lever mortice deadlock replacement, or a repair to a complex multipoint uPVC system, Langley Locksmith carries the parts and experience to complete the work cleanly and correctly on a single visit. As a 24 hour locksmith Slough residents rely on, we do not operate office hours — if you need a lock change at 7am before work or at 10pm after a delayed return, we are available.

Once the immediate crisis is resolved, it is worth spending a few minutes thinking about how to avoid a repeat. The single most effective precaution is a spare key held by a trusted person — a family member, a close friend, or a neighbour — who is reachable at short notice. Do not hide a key outside your property; under a mat, inside a fake rock or above the door frame are the first places an opportunist will check. A key safe with a secure combination code, mounted in a discreet location, is a better option and can be fitted by a locksmith on the same visit as a lock change.

If your door is a uPVC or composite type, ask a locksmith to check the door alignment and the condition of the multipoint lock gearbox as part of any service visit. A door that is slightly out of alignment is not just an inconvenience — it puts constant stress on the locking mechanism and will shorten the life of the lock significantly. Keeping the cylinder lightly lubricated once a year with a graphite or PTFE spray is a small habit that can add years to a lock's working life. And if your current cylinder is a standard, unrated euro cylinder — the kind that was fitted in thousands of Slough homes during the uPVC boom of the 1990s and 2000s — upgrading to an anti-snap, anti-pick, anti-drill cylinder is one of the most cost-effective security improvements you can make. Call 01753 251949 to speak to our team and we will advise on the right option for your door.

Langley Locksmith is a fully insured, mobile locksmith service covering Slough and the surrounding area — including Langley, Colnbrook, Cippenham, Burnham, Chalvey, Datchet, Stoke Poges and Windsor. We are on the road 24 hours a day, 365 days a year. Our team is experienced and trained to handle everything from a simple lockout on a quiet residential street to a failed multipoint lock on a commercial premises late at night. We carry a wide range of cylinders, mortice locks and multipoint lock components so that the majority of jobs — entry, repair and replacement — can be completed in a single visit.

Whether you are a homeowner wondering what to do when locked out of your house, a tenant who has returned to a lock that simply will not cooperate, or a landlord who needs a lock change between tenancies, the process starts with one phone call. We confirm the price before we come out, we work carefully and cleanly, and we explain everything we find. Call Langley Locksmith on 01753 251949 — we answer 24 hours a day, every day, including evenings, weekends and bank holidays.