Combo Lock w/ Pistons Concept
Armor+ (one of the mods I made):
http://www.minecraftforum.net/topic/363779-173new-lukes-modsarmor-trapdoors/
The hidden door would probably be put in the floor or something, or somewhere where the player wouldn't see it when they turned around to leave :P. I really like making stuff like this though, so if you have any ideas just leave a comment and I will try to make it!
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