Garnish your wages? Freeze your bank account? Put a lien on your house? I don't know, I've never been blessed with the urge to die on this hill. They sure as heck have a million options besides injuring you, and they won't injure you unless you do something other than merely refusing labor or payment. "He didn't pay the fine, let's go beat him up till he does" is not how things work in my part of the world.

Unlike, you know, actual slavery.