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How to Fix a Composite Door Replacement Lock Many homes have composite doors for their attractive good looks with improved security and insulation properties. The majority of issues with these doors are caused by a malfunctioning mechanism, and can usually be fixed without the need to replace the door. The most frequent issue is a locked that is sticky, which occurs when it becomes difficult to insert or turn the key. You can fix this problem by lubricating your door lock's internal mechanisms. Warped