All it takes is a narrow space for bees to enter. Do you know anyone who does vinyl siding? If you do contact the person and have the siding removed in that area. It is not difficult to do. In the picture I noticed the wires around the door and what appears to be a gap along the metal above the door. And it appears there is an awning.
Several years ago a friend had an issue with bees getting into his home. He found that the bees were entering in a tiny space in one of the support poles for the awning. The bees would travel the length of the support pole and then enter the home.
Try setting up a video camera in the area if you are unable to figure out where the bees are entering the home.
Edit: I forgot to mention that Home Depot, Lowes, and Amazon sell vinyl siding repairs kits. They work well to repair holes in siding. And Home Depot and Lowes will color match the siding for touch up paint