This morning at 6am I was called out to Billericay where a customer had returned home from a night shift. He unlocked his upvc front door pulled the handle down turned the key but the door would not open. I arrived within 30 mins gained entry to the property. The key was turning but not retracting the latch. The mechanism fitted to the door has this problem I advised the customer the gear box had broken in side and he needed a new one. I carry the gearbox on the van so the customer wanted the work carried out this was all done within the hour so the customer could go to bed knowing his front door was fine