Try using 2 cardboard boxes, 2 C-stands and some black paint.
We needed to add few shots of Gemma entering the artist upstairs space in The Warehouse to tie the spaces together better but we no longer had access to the original location.
So we mocked up the connecting doors in the studio using some of the original brown material drapped over 2 large cardboard boxes painted with black paint and cellotaped to a couple of C-stands.
The effect is hopefully seemless once Erik, our sound designer, added the correct creeks and knocking sounds. Our grader Chris never spotted the join and he’s watch the film a few hundred times!