Help! My SIM card is locked and the store didn't give me the PIN/PUK codes. What should I do?

Hi everyone, I recently got a new SIM card, but the store employee forgot to give me the plastic card that has the PIN and PUK codes written on it. I currently only have the barcode of the SIM, and my line is locked.

Has anyone experienced this? Is there a way to get my PUK code using just the barcode, or what exact steps do I need to take to unlock my line? Thanks in advance for the help!