Rather than worrying about what pocket you put your keys in; here's the way I do it. I get a spare key for my truck and loop it to an old long shoelace and a clip to attach to the D ring on my waders, and the key gets tucked into the pocket of the waders. I fish the surf and haven't had a problem yet, plus the key is readily available for when I want to move to another spot. My regular keys go in the pocket of my jeans but while fishing I use the spare and keep it attached to my waders so it doesn't get forgottn in a lock. Just my $.02 Ron