Good point Arney, I did need to clarify:

I have double cylinder deadbolts on all doors and a key is indeed required to get out. I put a hook at 3 feet from the floor near each door and put a key there.

They can't be reached by someone reaching in through a broken window.

My child has been trained to find them with eyes closed (we would play "fire drill" when she was little). I noticed that while she and I were practicing that the key would sometimes get dropped as we were rushing and fumbling with it so I put a chem light on each key to add some light in an emergency and make it easier to find when I drop it.