Thousands of San Francisco city workers on hybrid schedules must return to the office at least four days a week."

San Francisco Mayor Daniel Lurie set an April 28 deadline for the change, which will affect 10,000 employees.

Lurie said 70% of city workers are already working in the office five days a week, and the adjustment would bring between 8,000 and 10,000 employees back into the office four times a week.