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Message: <blockquote data-quote="Loren Pechtel" data-source="post: 4995361" data-attributes="member: 4679">Spring-load the lock.  The lock remains unlocked only so long as you hold the key turned.  Furthermore, make it so it can't unlock if there is any tension on the door.  (Make the bolt with a head that's bigger than the shaft.  This goes into a hole with a solid outer part and then an inner part that's a little piece of pipe held centered by some fairly strong springs.If you pull on the door so it opens when the knock spell goes off the bolt will be pressing on the pipe bit and the head will catch on the solid part, it won't be unlockable.  If you don't put tension on the door the door will unlock and instantly lock again.</blockquote>