Turn off your phone before going through customs or tsa. They can’t compel you to give your password out, but biometrics don’t fall under that category.
For those of us with GrapheneOS, you could maybe set up a different user profile solely for travel? Hopefully they wouldn't look closely enough to see that it's not the real one
Why would you get fired? Like they would have to justify it and I dont think "I was oppressed when visiting a fascist police state" is a legally permissible reason to fire someone in most countries