If you are in a cab, you can get to Burlingame and back, but will feel pressured. The int'l terminal, outside of security, has some decent quality dining, all of local origins. (No national chains permitted there). The terminal was designed to be a "destination" even for locals, but since only ticketed pax allowed past security, that idea bombed. (There are good dining choices behind Int'l security, too). If you aren't familiar with SFO, it is a quick walk to that terminal from wherever you may have arrived.