FILE - In this Feb. 1, 2021 file photo, an officer stands in front of a sign advising of vaccine appointments at a drive-up vaccination center at City College of San Francisco during the coronavirus pandemic in San Francisco. San Francisco city workers will be required to be vaccinated against the coronavirus when a vaccine receives full federal approval. The policy covering 35,000 municipal workers may be the first by any city or county in the U.S., the San Francisco Chronicle reported Wednesday, June 23, 2021. (AP Photo/Jeff Chiu,File)

FILE - In this Feb. 8, 2021 file photo people wait in line at a COVID-19 vaccine site in the Mission district of San Francisco. San Francisco city workers will be required to be vaccinated against the coronavirus when a vaccine receives full federal approval. The policy covering 35,000 municipal workers may be the first by any city or county in the U.S., the San Francisco Chronicle reported Wednesday, June 23. (AP Photo/Haven Daley,File)

FILE - In this Feb. 8, 2021 file photo a sign is displayed at a COVID-19 vaccine site in the Bayview neighborhood of San Francisco. San Francisco city workers will be required to be vaccinated against the coronavirus when a vaccine receives full federal approval. The policy covering 35,000 municipal workers may be the first by any city or county in the U.S., the San Francisco Chronicle reported Wednesday, June 23. (AP Photo/Haven Daley,File)