You may want to check out these guys: Santa Barbara Sailboat Charters - Boat Rentals - Kayaking - Santa Barbara Sailing Center
Not to far from you and they hire a lot of captains as they have a pretty big operation.
My wife got her ASA 101 from them.
One thing you may not know is that all the sailing instructors I have seen are very up front about being willing to accept tips. So while the $20 per hour may be about right you may end up with a little more.