SF tickets for more times than it actually sweeps (i.e., they do not always have a street sweeper come at all the restricted street sweeping times). They will also ticket you even if the street sweeper has already passed. :/
Sure, that link says "Once the street sweeping truck has swept the curbside, you may park your vehicle there, even if the posted sweeping hours have not expired," but I've heard enough differing anecdotes from street parkers to consider that thoroughly debunked (the colloquial plural of 'anecdote' is 'data', after all)
The recourse is taking a picture, noting the time, going to court, and hoping you win. Most people don't even begin to try all that.