Hun, I actually got my ds's hand and put it close to the oven door while it was on. Obviously not on the oven door, and not close enough to burn, just close enough for him to feel it was hot. The next few times he went to touch it, I reminded him that it was hot, and he looked at his hand and pretty much backed off.

Your little one might be a bit too young for that to work yet, but worth a try? HTH