Raising the minimum wage is never in isolation.
While it may seem great for those making the minimum to raise their standard of living, employers make-up for increased expenses by increasinging prices and/or reducing the number of employees working each shift so less people are forced to do more work.
Employees that had already advanced to higher paying jobs through experience and additional responsibilities, suddenly find new hires with no experience or knowledge will make the same or sometimes more than they are making, so they too want an increase well above minimum to compensate.
This all happened in my province when the minimum rate was increased substantially.
Now with the cost of everything higher as a result, those receiving the new higher minimum rate, often find they are now no better off and often worse off (fewer paid hours) than before the minimum rate was increased.