the tumbler-padlock analogy is broken. I know how to pick a lock mostly because the "how it works" info is open.
And importantly, when to use a deadbolt, or deadbolt + steel frame door, or a safe. All of which are well understood but can be implemented depending on when circumstances warrant. i.e. tool shed vs bank vault.
In this amusing video this guy goes over details of different locks, and explains why they are not all created equal.