Locksmith - Skeleton Keys
A skeleton Key has two meaning nowadays:
"Skeleton Key" is often used by people who actually refer to Master Key - a special key that can open several doors.
Master keys are more popular, and can be made in every locksmith shop
The Historical meaning of a Skeleton Key is a key that was in use mainly before the 2nd World War. Today it used mostly by people interested in Antiques.
Those Skeleton keys are long keys with a round hole in the end.
For those keys there is a special brass locks that are antique styled but supply better safety then the traditional Skeleton keys and the fitting locks.
Follow the link if you're looking for a provider of skeleton keys in New York.