Flash, the federal minimum rate has never been increased without sufficient warning. Its annual increases have always been gradual as to not shock Labor markets.
Respectfully, Supposn
The normal way to do it would be to increase it by 50 cents each time, twice a year. It would take 8 years to get up to $15 at that rate. Nobody in their right mind would just double minimum wage overnight.
I wonder how marginal a business has to be to consider $7.25 to be barely possible. Big Mac in Australia are cheaper even though their minimum wage is about twice ours. The truth is minimum wage increases would add little to almost any business' cost.