That's still an hour+ commute: 20 minute walk + 5 minute wait + 35 minute BART ride. Plus however long the walk/connection is on the SF side. If you're working at Embarcadero it could be a few minutes shorter; if you're where a bunch of the post-2010 tech companies are clustered at 7th street in SOMA, it's another 25 or so via bus or light rail connection.