It ends where your brother says it ends. If he's so afraid of losing his job that he won't put a stop to this himself then he'll continue to be a slave to the employer for as long as he works there.
My advice to him: Show up at 9 AM leave at 5 PM. Anybody has a problem with that say "I'm paid to work 40 hours, I work 40 hours. You want me to work more than 40 hours pay me overtime.
If the response is "You're fired" then he goes on unemployment and looks for another job.

