Why is my debounce not resetting when the script is finished?

So, I have a script that gets the value of an int value, and runs code depending on what the value is (for rn it just prints what the value is) anyways, I added a debounce the debounce is set to false at first (needs to be set to false for code to run) then set to true, then back to false. well, whenever debounce is set to false, I made it print("debounce is false"), and same for when its set to true. anyways, whenever I touch the brick (this is all inside a function btw), it does, as it should, print debounce is true, waits 20 seconds, then prints debounce is false but on the second go-around that you touch the part, it prints debounce is false, and never prints debounce is true and I have no clue why any help would be appreciated PLEASE DO NOT SPOON FEED ME.

debounce = false
game.ReplicatedStorage.GetPowerup.OnServerEvent:connect(function(plr)
	if debounce == false then
		debounce = true
		print("debounce true")
	if script.Parent.tier.Value == 1 then
        print("One")
	elseif script.Parent.tier.Value == 2 then
		print("Two")
	elseif script.Parent.tier.Value == 3 then
		print("Three")
	elseif script.Parent.tier.Value == 4 then
		print("Four") 
	elseif script.Parent.tier.Value == 5 then
		print("Five")

	end
	end
end)
wait(20)
print("debounce is false")
		debounce = false