Just to be silly.. These locks are not secure and you do not need to know the word. I have known how to do this on these types of locks since I was 12 which is no 26 years ago. https://www.youtube.com/watch?v=BcGJpVEq56Y

You can heard the other kid whisper the word to him at https://youtu.be/BcGJpVEq56Y?t=86 -- I am curious if the method does work however.

It's like a timing attack.

The locks are not precisely made. If you put tension on them, then in theory, it should be evenly distributed into the four notches in the shaft which mate with the dials. But in reality, one of the notches hogs all the tension, due to imprecise machining. You can turn the dials and feel for which one it is; when you find it, you have defeated that dial. It is now open, and so there are three left to attack the same way.

That's effectively how picking a pin-tumbler lock (most locks that use a key) works too. Put some torque on the tumbler, then push on each pin to find the one with the most resistance. Push that one up until it takes a set. Repeat until the lock opens.

There's ways around that. Simply put notches that don't go all the way through the dials and you've effectively defeated that method of attack. Kinda like trying to rake a lock with spool pins.