Depending on why your frameless glass shower doors won’t close, you may be able to fix the problem on your own. The problem could be loose screws, so it's a good idea to check the hinges, handles, and latches for loose screws. If you come across any, use a screwdriver to tighten them. If this method doesn't solve your problem, try to clean the hinge area. This can be accomplished by scrubbing it clean or brushing it with a vinegar solution.