Definitely don't ignore the behaviour, it just allows him to do what he wants without consequences and reinforces the bad behaviour. I agree that you should be taking away his favourite toys, tv shows, or screen time, as he continues. Let him know that you may be slower than him right now, but you're still his mother and the parent, and there are still consequences for his bad behaviour. Depending on his age, if worse comes to worse and the taking of toys away isn't working. Put him on a timeout in his room (empty it of any toys or things he can destroy) and hold the door shut if he continues to try and open it. And most importantly, always follow through with what you say you'll do, or else he'll call your bluff and continue to get away with stuff.

Toddlers don't usually understand consequences like that. Their minds can't piece together abstract concepts like that.

That could damage his throat if used too extensively. Shame on you.

Shock collars are considered abusive for DOGS by most decent people that know of them. They would sure as hell be considered abusive to use on a kid, even without considering that they could do permanent damage to the kid's throat, nervous system, and possibly brain. Hell, the kid could bite his tongue off and bleed to death.

Shock collars definitely can be a little harsh for dogs, my family uses an underground fence with shock collars to keep our dogs on the property, ours have never been an issue as we only used very mild shocks, just enough to deter them. Besides, some dogs are smart, I know of a few who would sit at the border of such fences so the collar sent warning beeps without shocking, and they'd sit until the collar died, and then left the property