I think it will work something like this...
a minimum wage worker will have more "buying power" for a short period of time, then prices of items will begin to increase again so manufacturers can offset the increase of pay, or just because of the greediness.
business will start laying off workers again, and will not hire everyday joe because he will not think a undereducated, inexperienced individual is worth $7.25 per hour, when he can pay a person holding a college degree $7.25.