skeleton key

With an oath, Dundee used his skeleton key to release the Yale lock with which the front door was equipped.

Or he came in with a skeleton key and out by the window, probably droppin' from the balcony.

"Come on," he said, thrusting his skeleton key into the inner door.

Was there a bank official to be264 bribed or a skeleton key to be made?

So he took from his pocket an electric lantern and a skeleton key which he always carried.