1) Check out your local community Parks and Recreation Center. They often have quarterly classes/events, with sections on arts and crafts that may include jewelry making.
2) Community colleges or even universities are a great resource -- see if they have summer courses or what they call "extension" courses in fine arts. If they don't have classes available for that quarter/semester, they still may have "open studio" time where you can use their art studios.
3) Bead shops. Great community bead stores often have folks with great experience behind the counter, even if they don't hold formal classes. Some big Bay Area bead stores include Global Beads in Mountain View, Baubles and Beads in Berkeley and General Bead in San Francisco.
4) Jewelry arts colleges do exist! I've taken an amazing seminar at The Revere Academy in San Francisco (which offers diploma courses and full on technician training) and have applied to FIT's jewelry design major.
5) Apprenticeships. Ask local jewelry designers if they are willing to teach! Up and coming designers often need some extra hands on big orders, or want to push of some repetitive work onto a helper. Get some practice and learn from someone more advanced in skill.
6) Online resources. OMG, there are many online jewelry supply companies that are offering video or printable jewelry how-tos. Not to mention You Tube! Do a search and you're sure to find a lot of different resources.
8) Local instructors. The DIY movement is only growing. Do a search for local artisans/instructors/classes and you are sure to find some. The Bay Area is lucky to have vibrant local artist communities and I've found awesome independent studios who also offer instructional classes.
Still don't know where to start? Stop by your favorite bead store and ask! If anyone is in the know, its people who love beads as much as we do.