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Some of the interior parts of the door lock are a cast pot metal that is easily broken if forced by turning the key. Look at the alignment of the spring latch and the deadbolt in conjunction with the strike plate on the frame. With the door about 1" from being closed, make a pencil mark on the door frame where the beveled spring latch and dead bolt need to enter. Check the depth of the recess hole, that there is enough room for the dead bolt to fully extend into without bottoming out. You may have to loosen the 2 screws securing the strike plate, outwards so the beveled spring latches sooner without having to slam the door. Dry silicone lubricant should be introduced a couple of times per year to the moving parts of the door, lock, and hinges. As mentioned by others, check the legs of the fold out stairs for proper extension. The hydraulic landing legs can sometimes creep allowing the trailer to lower. If the door is closed when this happens, the threshold of the stairs can be bent causing the door to forced upwards into the frame. A closeup inspection of the door to frame clearances as the door begins to enter the jamb will help you to solve this problem.
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