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How to Fix a Stopped Composite Door Replacement Lock Although composite doors are extremely top-quality, they do experience some problems occasionally. Fortunately, these issues can be resolved quickly and easily. One of the most common problems with locks is that they become stuck or becoming difficult to open and close. This can often be resolved by lubricating the lock cylinder and mechanism. 1. The lock is jammed. As homeowner it can be extremely difficult when your front door isn't closing properly.