I really agree with a lot of the things people are saying in this thread. I think the toggle should be Auto/Open/Locked. Auto makes it so that doors automatically open and shut for minions but stay shut for minions. Open lets allies and enemies alike through. And locked doesn't let anybody through. And the auto option can be balanced by mana locking or simply making it easier to destroy. UI for this isn't needed as left click could be Open/Close while right click Locks it.