If this works then you can open the door and it s time to replace the dead latch.
Latch mechanism stuck in door.
The lock mechanism may not work simply because the lock is dirty or dry and needs to be lubricated with graphite do not use any type of oil because this will gum up the works.
To take yours.
An improperly functioning latch may be the result of a poorly fitting door.
Before we look at how to repair a latch here is a note regarding all issues with upvc door latches or mechanisms.
A sticking door latch might require some lubrication or it might be jamming against the strike plate on the door jamb.
Taking the lock of the door is often simpler than it would be to take a deadbolt or exterior door knob lock of the door.
You can see where the cylinder entered the dead latch mechanism and pulled the latch back.
You should first test the door latch to ensure the latch is sticking inside the door and not due to a misaligned strike plate.
Turn the knob to open the door and release the knob slowly.
This is because the issue is not with the door and not even with the control the knob has over the stuck latch.
Jammed upvc door locks and latches.
The issue a door latch stuck due to a jamming latch will have no real variation between how the latch moves when it is pressed in or when the handle is turned both when the door is open and when it is shut.
First off if you can see and interact with the stuck lock button you will be able to address the set screws or twist off rose.
Take the latch and knob off of the door and clean them.