You don't have to be an audiophile to appreciate this DIY audio jack key holder, but it certainly helps. Mounted on your wall, you'll always have a place to plug in your keys when you get home — and you'll know where to find it. It's easy to build, too.
Pretty much everything you'll need to make this can either be found at your local hardware store, or, if you're like me and have too many pairs of headphones, also among the cables and connectors in a desk drawer somewhere. You'll need a drill press to cut out the holes for the jacks themselves in the housing you build, though. You might be able to have that done at your local hardware store, or use the facilities at your local hackerspace or makerspace, but it's the only tricky part you might run into. Beyond that, you'll just mount the jacks into the housing, put the housing on the wall, make yourself little stereo plug keychains to add to your keychain, and that's that.
When you get home, just plug in your keys, and if you choose good plugs, that satisfying click you get when you plug them in will let you know they're secure and not going anywhere. Hit the link below for way more photos and a full walkthrough.
DIY Audio Jack Key Holder Instructables