How to open a zipper suitcase on the lock?

Как открыть молнию чемодана на замке?

Several times, returning from distant flights and opening a suitcase, I found in it a note that it was opened, scraped and closed back.

Damage to the castle, I have not watched, and I was always amazed how they do it.

And here is the answer.

Roller less than a minute.