You're not guaranteed a living wage even with full hours. A single grievous wound or medical issue can financially cripple you depending on your insurance status. Hundreds of thousands of people are straight-up homeless. You have rights on paper but they can and have been sidestepped or ignored by corporations or the government when convenient to some end. It's just a third world country with more bells and whistles my dude. Big top-of-the-world stuff exists, sure, but our access to it is so often systemically restricted it might as well not be there for the average person.
Okay, I think you have a fundamental misunderstanding of what a third world country is. Dictionary.com defines a third world country as the "underdeveloped nations of the world, especially those with widespread poverty." and Miriam Webster defines it as " the aggregate of the underdeveloped nations of the world". When we look for a third world country, we look for widespread economic instability, issues with schooling and education, and a lack of human resources. A good metric for this is the Human Development Index (HDI) this metric takes into account Life Expectancy, Per Capita Income, and average Education. Then it ranks them from most to least. Usually HDI is used to determine LDCs (Least Developed Countries) [Liberia and a majority of other African countries], LDC's which are developing [India/Brazil], and MDCs (More Developed Countries) [Canada, United Kingdom, United States, etc]. Using this metric, you can see that the United States ranks 15th, just under the UK (
https://en.wikipedia.org/wiki/List_of_countries_by_Human_Development_Index). When we look at a country one would easily identify as Third World we would look at a place in an unstable region in the Middle East, like Syria, which ranks 154th. Places like this have fundamental issues that make life miserable for everyone. Low or no access to health care, widespread poverty (so much worse than places like the UK or US), and poor/complete lack of public education. Calling the US a third-world country is like calling Canada equivalent to Afghanistan. It just doesn't work. When you refer to homelessness those hundreds of thousands of people (while tragic) is out of 350 million people. Like I said, the US has issues, and I'm far from denying that. Healthcare, while accessible, puts people in debt. Cost of living adjustments are needed for low-wage workers. But we are not anywhere close to an LDC like Liberia or Syria.