The question isn't, "are minimum wage jobs worth twice what they're paid now?", it's "How has inflation already affected the minimum wage?"
The US minimum wage was bumped up to $7.25 in 2009. I don't know if any of you have been shopping since then, but I remember my girlfriend complaining that she could barely keep the food bill below $100 per week back then. Now she struggles to keep the shopping below $100 PER TRIP. We're not eating or using any more now than we were then. Also, since she works at WalMart, she shops there and she brings home groceries something like 4-5 times a week. THAT is inflation.
Minimum wage was never a comfortable living, but it's becoming more and more like a technicality to say people aren't slaves because they're being paid. I don't think that counts when minimum wage workers only see 78% of their wages after taxes and many have to pay rent, heat, water and electricity out of their sub-40 hr work weeks.
Looking at the math (I'll post it on request), I'll say inflation has outpaced the minimum wage, not the other way around. These workers are worth being paid and they just aren't anymore. Many people work 2 and 3 min wage jobs just to have an apartment to sleep in between work shifts. They have no free time and certainly no time to "get an education" for a better job. Work, sleep, work, sleep is NOT life, it's slavery. Only being paid just enough to pay rent and basic utilities is slavery. And last I checked, slavery is illegal.
So yes, raise the minimum wage to $15/hr. Not because the workers are worth twice as much, but because our money is worth half as much.

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(from bash.org) <Twig> I just had an argument with a girl I know. She was saying how it's unfair that if a guy fucks a different girl every week, he's a legend, but if a girl fucks just two guys in a year, she's a slut. So in response I told her that if a key opens lots of locks, then it's a master key. But if a lock is opened by lots of keys, then it's a shitty lock. That shut her up.