passwords as door keys

Hello again!

Is there a way to make a non-object a key? I'd like to make some doors open through an action (magical door requires you to dance a jig, mwaha) or through a spoken word. Can this be done plainly or does it require something a little more ingenuous, like hidden mobs?

Thank you,
Li

This can be done with a room prog, used with something such as mpopenpassage.