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How to Fix a Composite Door Replacement Lock Many homes are fitted with composite doors to give them a stylish look, improved security and insulating properties. The majority of problems with these doors are caused by malfunctioning mechanism, and can usually be fixed without the need to replace the door. A sticky lock is a common problem that is caused by difficult to insert or turn the key. It is possible to solve this issue by lubricating your door lock's internal mechanisms. Warped Doors Composite door