Fg passenger door not locking

[Pev323]

So here's my issue my passenger door won't lock it does everything find sounds like it locks and even the little thing on the door handle inside moves in to indicate its locked, any idea what it might only noticed it today probably been like a day since it was last working. 

[4321]

BA-BF are prone to problems with the actuator (door lock) but FG's dont normaly have this problem. New actuator & get it fitted