SAN JOSE, Calif. (AP) — Arwin Buditom guards some of the most successful high-tech firms in America. Joseph Farfan keeps their heat, air and electric systems humming. But these workers and tens of thousands like them who help fuel the Silicon Valleys tech boom cant even make ends meet anymore. Buditom rooms with his sister an hours drive from work. Farfan gets his groceries at a food pantry.