I have to defend the no lock thing, because I've done it once or twice myself. And, there's no way *I* could be annoying? Moi?
Why no lock? Because when I work out when I'm traveling, I don't bring a lock with me -- I travel light! Most commercial gyms where one can purchase a day pass don't loan out locks, nor do they offer a place to leave your stuff other than the locker room.
So, my choices are to schlep my street clothes with me, which would get in the way of other lifters (and get chalk on my usually limited travel clothes), or to leave my non-valuables in a locker without a lock. I choose the latter.
I don't see that it takes that much effort to find another locker if the first one you open has stuff in it. Think of it as part of your workout, like parking in the underused lot that's half a block farther away from the front door...
Be strong,
Kim