Even worse: Never lend your google phones to friends. If they hard reset the phone before handing it back to you, Google will refuse to reactivate them. I exhausted every option with their support and am left with a $800 brick.
If your "friend" refuses to log out and re-reset it then the correct thing to do here is to report it to your homeowners insurance. Your friend basically stole your phone. Insurance should pay for it and then they can go after your friend to get their money back.