The Cathay Pacific lounge will not store your luggage.
From the SFO airport website:
Can I store luggage at the airport?
Baggage storage is exclusively available at the
Airport Travel Agency, located on the Departures/Ticketing Level of the International Terminal, near the entrance to Gates G91-G102. The Airport Travel Agency is open daily from 6:00 a.m. to 11:00 p.m. No reservations are required for baggage storage. All baggage is x-rayed prior to storage. Rates are assessed per each 24 hour period that an article is in storage (articles in storage for less than 24 hours will be subject to the 24 hour rate), and vary according to the size of the object. Please contact the Airport Travel Agency at 650.877.0422 or
[email protected] for additional information.
https://www.flysfo.com/faqs
https://www.airporttravelagency.org/
SFO Airport: Luggage Storage?