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made of upvc have a multipoint locking system that secures the door at multiple points by turning a key. This improves security and energy efficiency. Contact a locksmith if you are having issues with your upvc locks. A professional locksmith will have the tools and experience necessary to disassemble the lock and wash off any dirt that has built up. They will also apply lubricant to ensure smooth operation. Cylinder If it's a non-responsive door handle or the inability to lock the door, these proble