Messing up with keys is a common habit with most of us. If the problem has gone to the extent of being grave with you, then I think you need some key-shirts. Don’t read it again…I didn’t miss spelt T-shirt as Key-shirts, it’s actually a shirt for your keys.
All you have to do is to make your keys wear these different colored T-Shirts and you’ll never get confused again.
Theses shirts fit almost any key, which means that size does not matters here.