If you continue to carry on using the lock there is a very good chance the lock will fail and the worse case scenario, it can fail in the locked position when you’re outside. This will mean getting a locksmith to not only get you in but also most likely change the whole locking mechanism, which will be inevitable an expensive affair.
You can adjust the PVC, PVCu, uPVC door by first opening the door and try to lock the door in the open position, if it works fine then the problem is with the keeps or door adjustment, the lock is fine.
While making this uPVC door adjustment, if a handle does not move take a look at the face of the lock near to the latch and see if there is a small plunger sticking out. This would normally be depressed when the door is closed so to check the lock push this in with your finger and then try lifting the handle, if its easy to use then your locks fine.
If your lock is stiff in the open position the lock has the fault, it may only need lubricating so pour a few drops of 3in 1 oil along the strip and adjust the uPVC door.
UPVC doors can be adjusted by a technique called "toe and heeling" as well.
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PVC, PVCu, uPVC Door Adjustment Tips
Initially,
Today we can find too many information online on different uPVC, aluminium, timber, wood, steel doors. You can select wide range of doors and windows as per your choice and requirement from a recognized place.
Whenever you are going to purchase uPVC door hardware then keep in mind that it should be of good quality, reliable, more useful and reasonable. If you select a good quality door knobs then it will definitely stay for long time and during replacement it will returns most of your investments. Having a good brand for uPVC doors Knobs and handles is more reliable then other.
There are many home doors available in market having different quality and shapes; PVC, PVCu, uPVC door is one of them with different shapes, sizes, and available in verities. The use of 

