I've posted a few times the ridiculous Silicon Valley mass transit. If your job is near a stop by the light rail tracks, lucky you perhaps. Most can't walk or bike 5 miles in commute traffic to any hi-tech job. They are spread out 100sq mi at min. No one can afford to live in a decent home near jobs but two income rich families. Those who have been there for decades and moved up.
If you're poor and live 40 miles south you have to get to the light rail. Bus train car (park) rideshare transfers etc. The further north you work the more hopelessly slow avg 17mph.
Repeat all on the way home. 4 hours total minimum?