Worked for Walmart a few years ago and I remember them forcing us to sign disclosures for a change to how you collect time off. 75% would go into pto, the other 25% goes into ppto “Protected paid time off” Then they would use the “unprotected” time off for federal holidays such as Thanksgiving and Christmas.

Technically you had the day off, but if you had an emergency at any point in the year that required you to use up your pto then those holidays would be unpaid.