Employer Forcing Us To Take Pto Days For Holiday Breaks Without Allowing Us To Work. Is This Legal?

Pre 2024 my employer gave all employees the days between Christmas and New Year's off with pay.

In 2024, due to decreasing revenue, they decided to semi-reverse that decision by forcing employees to take PTO for those days.

I'm not questioning their reasoning for the change but what's odd is that you CANNOT choose to work those days. You must take PTO.

Is this legal? They are based in California.

Edit: this has gone from helpful advice to the same old talking point over and over

For context, we get 3 weeks of vacation per year and one of those weeks must be used during christmas and new year's.