There are jobs where the staff receive tips, for example restaurant waiters. If the $15 per hour minimum wage is made applicable across these sectors, then it will impact very negatively on the business. Also, the main question is whether $15 per hour as minimum wage is fair or not. The question is whether the timing is right. The unemployment rate is at all time high, and this move will just worsen the unemployment crisis in the United States.
First of all if there is a job that gets tips on top of that 15 dollar per hour, let them be, that is their right and that is how it should be done, there is no reason why people should not make more money, there is literally zero argument to be made that people should be making less money than they possibly can with this, like I said any business that can't handle 50 year inflation and can only survive by paying 1970 wages to not fire people should bankrupt and owners should be so broke that they end up working for 7.25 dollars themselves to understand the problem.
However the unemployment is just a ruse that rich people use to show you how it is not the right time, believe me this is the right time, the grocery store type places, amazons, walmarts, targets and many other places made combined 1.8 trillion profit in 2020 thanks to pandemic, their workers got extra pay for just one month. Believe me the money is there, if companies start firing people that is because they are greedy not because they can't afford it.