Mezuzah Requirement

I recently built a shed in my backyard. It is totally constructed of resin. The interior is about 7’ x 7’ and the height at the apex is also about 7’. There are 2 doors in front. One opens to the right and the other to the left. When the doors are shut they are flush with the outside wall and inside wall, i.e. there is no doorpost on either side.
Question: Does it require a mezuzah?
If so, where do I put it?
Thank you.

It does not.