Aside from normal overtime, is there such a thing as mandatory holiday pay?

Q. Our business has recently started staying open on certain national holidays, including Thanksgiving and New Year’s Day. One of our employees was adamant that he was entitled to “holiday pay” for the time he worked on Thanksgiving, which he maintained was equal to 150% of his normal wage, even though he was not entitled to overtime that week. Do we have to pay a premium wage to employees who work on a federal holiday? ...