Kelly Services would be your first stop. I looked them up and there are a couple offices in San Diego. Give them a call and schedule an appointment.
However, I do agree with Waldonthe3rd as a GED would help you get more than industrial jobs. Also, you're at a disadvantage compared to those who graduated high school who I'm sure will get picked before you.
But do give Kelly a call. You can work part-time while getting that GED.