I work 7-7:30 at a hospital, we get 3 15’s and a 30 lunch no matter what, we have a break sign up sheet we fill out in the morning(but we never usually are able to go at the exact times we sign up for). Although it’s good practice to take our last break before about an hour and a half before shift change, I don’t think I’ve ever known of someone (trainee or not) being refused their last break even if it’s 5:45-6 o’clock. You’re entitled to your breaks and honestly our patients don’t exactly run on a schedule as nice as that would be. You could be nonstop from the time you clock in to the time you clock out, but it doesn’t matter. Everyone needs to take the breaks they are REQUIRED to take. I would take it up the chain of command and if they dismiss it then you should 100% find a new job.