I wonder if there any seat or couch at the pre security area in SFO.
Best,
From the usual reference for this sort of thing:
The quietest spot may be at Terminal 3 (landside). You can move furniture around pretty easily to create some privacy. Arrive early and there may be bigger bench-style couches.
There's definitely some benches in various departure areas before security as well. They generally don't look very comfortable to me, but they're there.