You might want to check out some of Schyler Towne's talks on the history of locks [1] [2]. His enthusiasm is infectious; he's obviously an expert, and obviously loves what he's talking about.

[1] https://www.youtube.com/watch?v=vGjkQ7qAyY4 [2] https://www.youtube.com/watch?v=C5CrR8-42x4