Minimum performance

As the cacophony from the left to increase the minimum wage continues, perhaps it's time to re-examine the concept of wages.

Wages are money paid by an employer to an employee for satisfactory performance of assigned duties.

If a minimum wage worker at $5.15 an hour can't get your order right at a fast-food restaurant, why does that worker deserve a government mandated raise to $6.25 or any other sum the left may toss out?