I do the same thing if I have to park in the sun on a hot day and I know I'll be back shortly; get out, lock the car, use the key fob to precondition the car as I'm walking away. Sits happily in the parking lot and when I return the cabin is still comfortable the way I left it.I do it all the time.
Yesterday, 95 degrees, I stopped by the grocery store for a couple of items. An S-class $100K+ Mercedes pulled into the next space. The wife told her husband, you stay with the car to keep it cool. The electric fan on the M-B is as noisy as a helicopter lifting off and requires that big ICE running just to rotate the small AC compressor. I walked away from a totally silent Bolt and it was cool when I returned five minutes later. The range displayed had not dropped at all.