Did you lock the door

I have a weird fascination with old doors and locks. I believe that this lock was in Versailles. I love doors and locks because in the U.S. we usually don't have the history to have interestingly old locks and we also don't have the beautiful tall old doors that have seen so much. Locks have been man handled and have the most interesting stories like who has lived in the biulding, has anyone tried to break in and what has happened on the street in front of building. 

This lock probably doesn't have to worry on if someone was going to break in because it's on an inside door, but I wonder who opened the door or who had locked it and with what secrets did they lock with it.