The California Labor Statute regarding lunch breaks appears below. It does not appear that there is anything that precludes teh employer from makingth ebreak available later in the day.

Please click ACCEPT below

512. (a) An employer may not employ an employee for a work period
of more than five hours per day without providing the employee with a
meal period of not less than 30 minutes, except that if the total
work period per day of the employee is no more than six hours, the
meal period may be waived by mutual consent of both the employer and
employee. An employer may not employ an employee for a work period of
more than 10 hours per day without providing the employee with a
second meal period of not less than 30 minutes, except that if the
total hours worked is no more than 12 hours, the second meal period
may be waived by mutual consent of the employer and the employee only
if the first meal period was not waived.
(b) Notwithstanding subdivision (a), the Industrial Welfare
Commission may adopt a working condition order permitting a meal
period to commence after six hours of work if the commission
determines that the order is consistent with the health and welfare
of the affected employees.