Tibard takes his mace in two hands and goes to work on the lock. With ages of rust, the iron has weakened significantly. In just a few quick bashes, the lock crumbles to pieces, falling both inside and out. The mechanism on the opposite side of the door collapses to the ground with a thud.
The thudding continues. Peeping into the opening in the door where the lock once was, it is now clear that the thudding is coming from a small, animated skeleton, unceasingly throwing its body against the door, backing up slowly, and repeating the motion. Over and over, the little assembly of bones, dressed in tatters, thrashes violently at the door of its prison.
(OOC: Knowledge Nature and Arcana checks, please.)