I've had the opportunity to spin both, and they both take effort.
I don't know how much force I'm capable of generating, but around 2004, I had a day job that required me to occasionally lift 40-pound boxes. I was able to do that, but I don't think I would have been able to lift weights that were too much heaver (certainly not on a regular basis). I'm not sure how that compares to the population at large, but I would guess that my strength is probably a little below average.
I found that if I gave it my all, I could fairly consistently make the Price Is Right wheel spin for about one and a half rotations (this was between roughly 2006 and 2012; I don't know whether they've changed the friction on it since then).
I had the opportunity to spin the Wheel of Fortune wheel once in 2015. Because it was my one chance to do it, I spun it at full strength. I was able to get the wheel to make one complete rotation plus one wedge. If I was a contestant on the show and had to spin it multiple times within twenty minutes, I assume I wouldn't be able to get that result.