As someone who has worked those type of jobs for years, the grass is indeed NOT greener on the other side.

Those jobs have a much lower barrier to entry, so in addition to being paid less, employers can hire and fire much more easily.

Also don't fall for the "sales is such a great skill to have!" When was the last time a salesperson convinced you to buy something?

What will you have to show for the years you're going to waste in these type of jobs besides a few bullet points on your resume?