That's not how it ends up. We have a very good local restaurant that can't hire enough employees to run their original 7 AM to 9 PM hours. They have cut back to 7 AM to 3 PM and still have difficulty keeping it staffed.
The business can just cut operating hours and staff for when demand is optimal. The Indian restaurant is open 10 AM to 2 PM for lunch and 5 PM to 8 PM for dinner.
The "rate of pay" is minimum wage, so 32 hours @ minimum wage. If they need 40 or more to pay the rent, they will have to work for another employer. Having 2 or 3 jobs is very common for minimum wage earners. Especially where hours are limited to avoid paying benefits to full time employees. Thank Obamacare for that aberration in hiring practices.