San Jose State University Hi, if you go to San Jose University and saturday and sunday afternoon, they have classes over there. It is taught by Kevin Zheng, he was on the China national team once. I'm taking classes from him right now, it helped me a lot.
Currently I don't know if anyone is giving out badminton lesson in San Francisco. Few of the top junior player who lives in San Francisco comes down to San Jose to take class from him. I personally think it's worth the drive. I live in Hayward myself.
I think it is not difficult to find a coach, but it's difficult to find a court where you can use it for getting lesson. Most of the place is for open gym therefore you wouldn't able to use the court to get lesson. So far I don't know anywhere else you can rent court and get lesson.