Issue when trying to turn off a push to start car

I have had this issue a couple times, I turn my car on in the driveway like
normal, then realize that i left something in the garage. To make sure the car
doesn't turn off, I leave the fob inside the car in the passenger seat and close
the door. After driving the car, I park and try to shut off the car like normal. A
message appears, "No remote detected. Press the brake to restart.". I try to
just press the brake, which does nothing until i also hit the push button to
start while holding the brake. Instead of trying to turn the car back on I tried
to get out of the car and lock the doors, which does nothing. I got back into
the car, restarted it, drove it around, then parked again and it worked fine.
Can someone explain why this is happening and what should be done?