Now
that would be cool! A
magnetic door!
(we know you meant
metal, but thanks for the laugh - I needed it!

)
If the doors are metal, then a magnet will stick to your door. Do you have any of those business-cards-as-a-magnet on your refrigerator from someone advertising their business (real estate agent, HVAC repair service, pizza delivery number, etc.)? We get those in the mail all the time, and put 'em on our already-too-cluttered fridge door. Take one you don't care about, and cut it to fit a LGMH, glue/tape the LGMH to the magnet (covering the pizza delivery phone number - oh well), and put it on the metal door.
Have a great time!