Politicians often pass laws that ignor the resulting effects on incentives. Cost-conscious businesses naturally react to a suddenly higher input cost (labor) by substituting another input that is unchanged in cost (capital). Self-checkout lines at stores are one of many examples.
The process of ordering and picking up food at both restaurants and fast-food places is labor-intensive and ripe for automation, and a jump to $13.09/hour in San Diego would incentivize owners to quickly replace workers with machines.
In europe, with much higher minimum wages, automation in food establishments is already farther along than here.
