Does the door not close properly?
You better call a locksmith.
The vast majority of the doors are being exposed to sun and rain so in time the doors will be affected. Wood or upvc doors, once they are exposed to whether conditions means someone should have a look, from time to time, a quick service, adjusting the hinges, align the door, adding oil to gear box.
If the door not closing or opening properly you should call a locksmith asap. Will not cost a fortune but it might be ending up locked out or in. Upvc and composite doors are the worse. It is common on upvc doors that the mechanism it is easy to malfunction in the close position. So if there is any stiffness once the key has turn, or the door needs to be pushed hard or pulled hard to be opened , please call a locksmith. It will take 1 minute and it will save your door.