I had one of those pouches up until a month ago.
It's called a faraday bag.
My key wouldn’t work when in the bag.
I always unlock the passenger door first and put my handbag on the seat, then walk round to the drivers side.
Only I was a complete half wit one day, and after unlocking the car, without thinking, I put the key back in the bag, so as I walked around the car it locked.
Car key, house key, phone and bank cards all locked in!
I ditched the bag after that.