Nice Strawman. They don't think they're entitled to "The World" as you put it. It's the principle, the company is forcing you to stay on your own time, in a busy Apple store potentially cutting your break in half. They are dictating to you how you spend your time off, which they are not allowed to do. In a busy Apple Store yes you could be losing half an hour a day. For someone who works a lot of days they could be losing a days pay every 2 weeks, 2 days a month. 24 days pay a year. That's potentially nearly a months pay lost a year. Obviously this is a worse case scenario but it still stands.
If you're perfectly to bend over and take it, having your free time dictated to by a company who isnt even paying you while they do it, feel free. but don't drag everyone with you.