Is a keyhole a lock?

The FB theme this week is locks so I decided to try and take a pic through the keyhole to see my Victoria tiles in the hallway. It proved rather difficult and this was my best effort. But then I wondered is a keyhole a lock. Answers on a postcard pleases.

Well aft two days travelling and a great cricket match last night, today and tomorrow are officially days of rest as I recuperate and re charge the batteries. Man Booker prize longlist arrived yesterday so need to get hold of the books and start reading.