Presumably if it is a upvc door the lock is the type which screws to the door edge and locks with four latches and the main bolt.
Upvc door locked no key.
A basic pin tumbler lock consists of the plug the key pins driver pins and the springs at its core assembly.
Turn it in the direction that you normally turn.
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You will need lock picking tools to unlock a door without a key.
Unscrew this plate and remove the latch from the door if possible.
These tools consist of a rake a hook and a tension wrench.
You can open a locked door without a key and without causing damage.
Place the short end of the tension wrench into the lock as far as it will go.
As people said you could drill it but sometimes that won t work.
Someone has mentioned the posidrive screwdriver and yes it is easy to remove the complete assembly.
It isn t easy without a key but it is possible.
With the lock being designed in 3 main bits and the central.