I was going to guess "minimum wage" which is $18.07 in San Francisco, but I decided to actually do a job search for "Warehouse Clerk" and found a nice opening for Disney that includes health insurance and requires no experience. It pays $28 an hour, which works out to about $58,240 a year*

* not counting vacation days that may or may not be provided or possibilities for overtime * simple math is $28 * 40 hours per week * 52 weeks per year