Trust me, it works

that won't work for me my room's a mess

Leave it in your shoes. That way when you go to put them on, the thing will be right there

Not really sure how to leave something IN the floor.

Or just set a reminder on your phone? Leave a note by the door???

I normally just put my keys on top of the important item.

Leave your keys on top of them

Problem is everything is already on the floor..really should get off funsubstance and pick shit up...