Minimum wage has nothing to do with the consumer price index and minimum wage is not meant to be a freaking career choice. Why should mom and pop stores be compelled to pay a shelf stocker more than the freaking job is worth? The unintended consequences to raising the M.W. is that small businesses will fire minimum wage people, invest in robotics and sweep the floors themselves.
I suspect that many of them will go out of business. It's hard enough to compete with the Walmarts and Amazons as it is, but throw in the higher labor costs and it gets damn near impossible. And for some small businesses, it's enough to just close up shop because the investment in time and money just isn't worth it.