Mandatory commute (e.g. from site entrance to site) is considered work time. Commute you inflict on yourself by choosing to live elsewhere is not.
It turns out that it's not actually my choice to live somewhere that requires commuting to a work location dictated by my employer.
How about your employer has to cover the rent or mortgage of an average single-family unit within a 30-minute rush hour commute of the office if they require you to come in?
This is compounded in the bay area by its ridiculous housing market.