The 2013 and newer Leafs have a variety of options for this. The default "automatic" mode behavior is to lock the plug when charging then unlock when charging is complete. Not totally sure if you can unlock the charger.

That was my though exactly. The Nissan leaf does have a car side lock. Since things are getting heated one should use the lock in a responsible matter.

Also with CarWings, Nissan remote control, I believe you can lock/unlock on the fly without having to go to the car. So pretty much no reason to use it.