Here's a really simple thing that has saved me untold grief over the years. In every place I've ever lived since I started college, I have affixed a cheap little sticky hook to the wall next to the main door and I hang my keys on it EVERY time I come in -- without fail! This way, I ALWAYS know where my keys are. I lose lots of things -- trust me, I do - but my keys aren't one!
I have found that I'm much more likely to use a storage idea or device if it makes sense and is easier than the alternative. Keeping my keys by the door works for me!
Now, between my husband and I and our various cars, truck, motorcycle, and spare keys, we actually have a row of pegs that hold all of our keys. When we have guests over, we ask them to hang their keys there also. That really helps in the late evening or early morning if one vehicle needs to be moved to let another one out of the driveway!
Works for me!