Front Passenger Door Not Locking

[gecko1001]

The front passnger door is not locking and can be opened from outside even though all other doors are locked, when I press the open door key fob function all doors unlock but a noise comes from the passenger door which obviously must be something to do with the fact it did not lock in the first place.

[gecko1001]

Forgot to say this started after spraying some wd40 into lock

[paul.h]

Possibly the lock is a bit slow to work so the car is unlocking due to the delay. You could try more wd40 to try to clean it more or remove the door card to get to the lock and move it manually a few times to free it. If this does not help then maybe you need a new lock.

[gecko1001]

Replaced the lock in the end