How hard is it to turn the front wheels in a parked car?

First of all I don’t drive. This is a serious question and I honestly don’t know.

I was just sitting on my porch and noticed that the wheels were turned sharply on my sisters parked 82’ Volvo. How hard is it to turn the wheels while stationary? Would a five year old have the strength to do it?

Three scenarios:
1: No power steering
2: Power steering but the car is off
3: Power steering but the car is on