door sticking

I was called to Collier Row Romford in Essex yesterday by a customer who had a upvc door that was sticking when she was opening it. After checking the door I found that the hooks at the top and the bottom were not retracting enough to allow the door to open. I removed the keeps so the customer could open and close the door, I ordered the new mechanism which was delivered today. I rang the customer who asked me to repair it today whilst I was there I replaced the handles as well As I was about to leave the customer asked me to look at the front door as they was having trouble double locking it .with a few adjustments it was locking perfectly