As a rule, the only skill entry level jobs teach anymore that apply to future jobs is how to eat shit and keep going. Every single habit you would learn would need to be unlearned to be valuable in skilled labor. You need to be independent and able to think of novel solutions to provide value at higher skilled jobs. Entry level jobs will grind you up and fire you under some made up offense so you can't even get unemployment. You succeed by being as close to a robot as possible.
Eh, I've had this experience at well-salaried jobs too. It's a job thing, not a minimum wage thing.
1. Workers whose contributions are undervalued.
2. Workers who cannot be trained or educated to provide high-value labour.
These are both issues.
(There are other categories: parents, caregivers, the disabled, sick, or handicapped, etc. But the two classifications above represent a major part of systemic failure of labour markets.)
If you think the class gaps and problems of lack of cross-socioeconomic empathy are an issue now, wait until a middle class worker can go 24 hours without ever having to interact with anyone making less than them.
"Raise taxes to fund foodstamps? Crazy! I hear the poor are doing just fine eating their insect protein cubes. I saw a report about it on the TV last night!"
Hell is other people.
High minimum wages price many entry level workers right out of the market making it difficult for them to gain these entry level skills which are important for subsequent jobs.
[1] http://www.pewresearch.org/fact-tank/2014/09/08/who-makes-mi...