A tip for your keys at the store.

I don't like keys in my pocket and when in a grocery store I can't find a good place for my sunglasses where they won't end up falling on the floor from bending over to pick up something off a lower shelf.
One day I figured I would try something and it works really well.
Take your sunglasses and fold them, and as you do put each arm of them through the ring of your keys.
Once the glasses are folded up with the keys on them drop the keys down between two of the wires in the upper part of the basket where a kid would normally sit.
The weight of the keys keeps the lenses off the basket wires and keeps your keys captured where they can't go anywhere.

I have been doing this for years and figured as minor as it may be, it could be a good solution for your glasses and keys both.