Frame it properly for a door. The door can handle 10lb or so of spices no problem.

Picture 4 add shelf support brackets where the thick blue tape shows a middle stud if you don't want a center support. Box each shelf with 2x4 framing and add a center support would be cheaper but slightly reduce space.

Above the height of the door you need to step the shelves back.

If you want to go all out get a commercial grade 8' interior door off craigslist and cut it to fit for floor to ceiling access.