Employers are required to pay employees, at their regular rate, for all paid-time-off that the employee has accrued. Mandatory Vacation Time: California employers are not required to give vacation time. Sick leave is another matter. California passed a law in 2015 mandating that employers provide at least 3 days of paid sick leave a year.
https://www.classlawgroup.com/employment/california-labor-law/vacation/