I hope this tool that can help you to open a door without touching the handle. There are holes that will help you to attach a strap or lanyard to hang it.

Made for an L size hand (mine :p ), I can adapt the file if you need it or you can just resize the model in your slicer.

Notice: the shape of this tool looks like a "knuckle dusters", even if it has absolutely not this purpose do not use it that way (actually you will hurt yourself more using it that way!!), and be careful in some country this tool might be seen as illegal due to its shape. It's to open a door, and only a door. So I made another version of this ! which is the v2, and I added an hook and change the design. Tell me what you think :)