You didn't kill the yeast but it might have gone dormant. There are two options: try rousing the yeast or pitching new yeast.
Trying to rouse it might cause oxidization. I'd pitch new yeast, dry yeast is cheap. Since it's dry yeast and only 4% ABV in the fermenter, you could probably get away with just rehydrating a pack and pouring it in.
Thank you Lego Movie for letting me know that I'm the serious, unfun, mean dad who never lets his kids play with his toys.
On deck: Barleywine, Dampfbier, Belgain Golden Ale, Hazelnut Sweet Stout, IRA, Rye-weizen, Wit, Uinta Hazel Clone, Uinta Yard Sale Clone.