Don't know if anyone has ever had a door lock jammed but I have twice, both within the last 2 years.
The symptom is unable to lift the unlock button while door handles ineffective (inner and outer) at releasing the door.
The first time it happened I ended up destroying the door card to...
A friend closed a dropped door carefully by holding the outer door handle up, which seems to have confused the lock mechanism.
Afterwards it wouldn't latch at all. Got around it by having someone keep the closed and then using the central locking switch to force it to latch. It did. Now it...