Because when you raise minimum wage, that means employers of the minimum wage earners need to push up their prices so that they're still making the same profits. (Actually, the same is not good enough, the profits need to exceed the previous years). The price of everything ends up inflating and minimum wage earners end up getting less for their money, despite having "more of it".
That would only be true if the goods minimum wage workers produce are being bought only by minimum wage workers. In reality the price also goes up for incomes above minimum wage so in a sense raising the minimum wage is a transfer of money from higher earners to lower earners.
In reality what happens, is those jobs go away (jobs like retail) and they are replaced with slightly higher paying jobs (like Amazon warehouse worker) except at a rate of about 1 new job for every 10 previous jobs.
