You’re going to have to build a cabinet, and install the hardware to the door of the cabinet.

Post a pic of the space so we can help you properly. What surrounds the area where you’d like the pantry to go?

It’s just an open walkway next to the kitchen. I want the pantry next to the wall and shelving next to it

If you don’t want to build your own pantry, you can order a custom size from Barker or Barker modern. It will cost less than a lot of places, but it is still going to be expensive. If you or someone you know can build it (especially if you don’t need to match with anything else) then I would go that route. You can also build your cabinet and then just order a custom door from Barker door.

Make sure you read what the recommended size of cabinet is for the pull out.

If you aren't too concerned with the look of the cabinet, Ikea has several choices of frameless pantry cabinet choices. They are relatively inexpensive.

It could work. We did have shelving in there at one point, but I didn’t like the overall look of that area. I tore out the shelving and refinished that area and it looks really nice.