So you feel a bit forgetful ?
It's ok, It happens to me almost every weekend, Saturday night around 2 am, trying to find the right key to the front door.
The tip here is to colour the Key hole, along with the Key Head in the same colour of your choosing.
One colour for the Garage door, another for the Front Door etc.
Especially useful if you have many lookalike keys, to different doors.
Step #1: Just paint them
Paint the same colour around The Keyhole + The Key
Bills of Material not included, get a girlfriend or fetch some from your wife's make-up drawer.