Locker Status Indication Lights

It always annoys me how I have to open up many lockers to verify if they’re full or not when storing stuff. So I would love a feature where the locker light on the handles that shines blue would turn red when the locker is full so you know it without opening the locker. This feature could be expanded if the locker light is blue when the locker is empty or only half filled, turns yellow or orange when the locker is more then half filled. And finally, turns red when the locker is fully filled, so you can immediately see how full your storage is.