In the photo above, you will see the Portmag keyholder used in a clothes horse application. If you look carefully, you can see 6 neodymium magnets connected to each other. This adds to their strength. My clothes horse is made of metal.
My clothes horse is right near my front door. I don't leave my keys on the device for extended periods of time. However, I could do if I wanted to as the Portmag keyholder is a powerful magnet or combined magnets acting as one unit.
I place my keys onto the Portmag keyholder a short while before I am ready to leave my place to go for my errands, visits etc. Portmag would be classed as an invention under the new use for existing products category. I don't have the funds to patent this invention though.