Depends on the exact circumstances and local trespassing and fraud laws. Ask a lawyer for details if you get a chance- perhaps reach out to LegalEagle, who makes Youtube videos about interesting laws and legal situations.

You might like https://old.reddit.com/r/ActLikeYouBelong/

I'll just say that it was a very "September 10th"* thing to do.

* That is, before 9/11.

...Then there was the guy who got into the Louvre by walking backwards into the exit.