"This is the equivalent of that the pros call 'bumping'."
Nope, bumping is using a 'bump" key to get the pins to jump up while putting a little pressure on to they lodge into place. This person is using the sound to be able to decode the key so to originate the correct key to fit in the lock.
All of my house locks have varying spring strengths so they can't be bumped, but maybe this sound approach might work.
Knowing some basic locksmithing is handy. Ask the Weasley twins.
Biting the hand that feeds IT
