Over the years my keys have traveled all sorts of place in the A-Frame until I added the Gear Tie hooks. They keep my keys, glasses in one easy to locate yet 'out of the way' area
I now use earth magnets recommended by OP in other spits in the kitchen to attach frequently needed items on the kitchen shelves above the counter. The magnets are certainly small but powerful!
I used to use the magnets (for key holder) but they got knocked off too many times and then I started to worry about the electronics in my truck key (replacement key is 60-) and the autolock/alarm which is also on my key ring.
2012 FR Flagstaff T12SDTH
1996 Shadowcruiser Pop Up Truck Camper
1967 Newell Motorcoach
2003 Ford F150 5.4 V8 Triton Super Cab
2004 Nissan Titan LE 5.6 V8 4x4 Crew Cab