Can hourly employees be paid for holidays when the office is closed and for when the employer takes vacation?

The employer usually doesn't take vacation, or at least doesn't close the business when they do.
It is quite common to offer holiday pay for holidays if the business is closed on a day it would normally be open.

Can they? Sure. Will they be? Doubtful

Paid vacation is common, especially if there is a union. Not usually for holidays, though.