Do you have some drawings or pictures to share

What type of door... Barn door could mean a variety of doors. Are you thinking of a pocket door or rolling track door? If the window in your pantry allows a sufficient amount of shelving, then keep the window. You may consider adding shelves over the window and use a light filtering shade as to keep a pleasing exterior appearance.

There are plenty of examples of using a barn door for storage areas in you do a search.

I thought that i uploaded the images must have made a mistake...

you can comment on your dilemma and add them there in jpeg. Unfortunately you cant add the images to the original dilemma post.