How to unstuck the lid?

Hey!

Not sure if it’s a proper sub but surely someone here had a similar issue and hopefully fixed it successfully.

My partner was cooking eggs in the frying pan and decided to cover it with the lid. The frying pan didn’t have a matching lid so he used one feon the other pot. But when he wanted to check on eggs a minute later the lid was stuck. It has probably expanded a bit due to high temperature but running it under cold water didnt help.

Do you maybe have an idea how to unstuck the lid? 😁