Unfortunately I think Pharmacy technician (at least national certification) has or is moving to requiring a course to become nationally certified. You might be able to get into Walgreens/CVS before that happens and they will pay for your exam. Pharmacy tech is a boring job though (please do not grill me folks, I have worked as one).
Most to least useful: Research/lab assistant, CNA, pharmacy tech. I would go with whatever pays best.