He began to work at the lock with a skeleton key.
Somebody was working the outer door open with a skeleton key.
He could tell that a skeleton key was in the lock.
He closed the door behind him, locked it, with a special skeleton key.
Did you really think the skeleton key was a place?
He tried a thin skeleton key and opened the door without difficulty.
Like having a skeleton key that'll open the door to every room.
Someone out in the hall was trying to release the lock with a skeleton key.
He got the apartment door open in a swift minute or so with a skeleton key.
The oldest books are kept in a glass case, locked with a skeleton key.