Lock Not Turning? Let Us Diagnose It Before You Force It

Before you force it

When a key suddenly stops turning, the instinct is to push harder. Resist it. Forcing a key bends it, and a bent or snapped key inside the cylinder turns a diagnosis into a replacement. Likewise, spraying cooking oil or WD-40 into a lock can gum up the mechanism and make things worse. The safe move is to stop, leave the lock alone, and get someone to look at it properly. A lock that's seized for a reason will keep seizing until the reason is dealt with.

The usual suspects

A key that won't turn usually comes down to one of a handful of causes. The most common is alignment: a door that has dropped or swelled slightly puts the bolt under pressure against the keep, so the mechanism can't move. Next comes the lock itself — worn internal parts, a tired spring, or grit and old lubricant building up inside the cylinder. Sometimes it's the key: a worn or copied key can work its way out of tolerance. Occasionally it's something external, like paint sealing the bolt or a strike plate screw working proud into the lock's path. Each of these has a different fix, which is why diagnosis comes first.

Adjustment versus replacement

Where the cause is alignment, the fix is often adjustment rather than anything to do with the lock: easing the door, repositioning the strike plate, or tightening hinges restores the bolt's freedom and the key turns again. Where the mechanism itself is worn, lubrication and careful servicing can help a young lock, but a genuinely worn cylinder or latch usually needs replacing — and replacing it ends the cycle of stiff mornings and jiggled keys. We'll always try the least invasive sensible option first, and we'll tell you honestly when a lock has passed the point where adjustment is worth paying for.

What we check during the visit

We work through it systematically: does the key turn with the door open, and does it turn when the door is closed and latched? That one distinction usually separates a lock problem from a door problem immediately. From there we check the bolt's movement, the keep's position, the hinge tightness, the condition of the cylinder and the state of the key itself. By the end we can tell you which of the causes is at work and exactly what fixing it involves.

Safety and limitations

A lock that won't turn on your only external door is a security question as well as a convenience one — if the door can't be locked properly, that's worth treating urgently, and same-day may be available. One caution: if the key won't turn and you can't get into or out of the property normally, tell us when booking, because that changes how the visit is planned. If the fault turns out to be inside a multi-point mechanism or a specialist lock that needs a locksmith's input, we'll say so rather than guess — and if we can see the lock is at real risk of failing outright with the key inside, we'll warn you before trying anything that could leave the door unopenable.

Book a diagnosis

Booking is simple: tell us which door, what happens when you try the key, and whether the door is currently usable. You pay a booking fee on booking, labour is hourly with the rate depending on how soon you need us, and the full cost of the fix — including any parts, quoted separately — is agreed with you before work starts. Don't spend another week wiggling the key; let's find out what the lock is actually trying to tell you.