Bar Lock
A bar lock is a kind of lock on a door usually found in all dungeons. These locks cannot be opened unless a certain task in completed. (For example, defeating enemies, moving a block/pot, etc.) They are called Bar Locks because of the clearly metal bars that drop down in front of the door to stop you from opening it. The bars usually drop down right at the moment Link enter the room, and lifts up when the task in completed.