Easiest way is to call the airline and ask if the flight is oversold.

If it is, get to gate early and ask if they are looking for volunteers, if they are, ask what they are offering. If you like the offer, tell them you'll volunteer.

Generally, you can't ask for compensation, they'll tell you what they are offering, and you get to say yes or no.

I would scope out possible flights if you do get bumped, so you can make an informed choice.

Good luck.

Although, not likely at SFO, pray for 110 degree heat wave. That should thin the air enough to cause a weight restriction and force more bumping