Door Glitch

I'm making a sub-dungeon and I can't seem to get the doors to work correctly. I go to the menu and set the door type to locked, but when I actually play the game, the door is unlocked. Also, the shutters don't close, and I can't walk through the walk-through wall. Any idea why this might be happening? I also tried setting the level nuber to a number greater than zero, but when I do that, link is invisible and I can't move him.