If you have a UPVC or Composite door on the entrance to your property and you are having problems locking the door when you lift the handle up and try to lock it, please do not force the lock as you may damage the multipoint locking system inside the door and the door may stay locked causing all sorts of problems for you.
This can be a very expensive problem to rectify and an ordeal if your locked outside your property.
A good test to prevent this happening is to open the door lift the handle and lock the system when the door is open, if the door lock works well whilst the door open you will need to make some minor adjustment to your door.
Contact a locksmith for a quote to make adjustments as soon as possible.