Smart key problem

I have 3 smart keys and on 2 of them the function where you can unlock and lock the doors from outside the car by pushing in the spot on the smart key does not work. The functions to unlock by touching the door handle and to lock by pushing the button in the door handle works fine and the function to start and operate the car with the key not in the ignition slot (e.g. in your pocket instead) works. All functions of the 3rd key work. I have tried replacing batteries in all keys.
My question is whether there is any benefit to having the dealer check the malfunctioning keys on the dealers computer for $105. I am figuring that the dealer's computer will not, or is very unlikely, to reveal any way that the malfunctioning keys can be made fully functional (by reprogramming or any other dealer fix) and that if I want another fully functioning key, I should just buy one and not spend additional money just to be told the 2 keys cannot be fixed.
I am thinking that something has likely worn out and the only repairs that can be made to these keys is replacing the battery or reprogramming the chip or whatever is in there.
Thanks for any help in figuring out whether it is a waste of $105 to have the dealer check the keys on their computer.