How to make block reset blur affect after touching again?

This script inside a block makes things go blurry when stepped on, but idk how to turn it off after stepping on again!

local part = script.Parent

local function onPartTouched(otherPart)
	local partParent = otherPart.Parent
	local humanoid = partParent:FindFirstChildWhichIsA("Humanoid")
	if humanoid then
		game.Lighting.Blur.Size = 56
	end
end

part.Touched:Connect(onPartTouched)

local function onPartTouchedagain(otherPart)
	local partParent = otherPart.Parent
	local humanoid = partParent:FindFirstChildWhichIsA("Humanoid")
	if humanoid then
		game.Lighting.Blur.Size = 0
	end
end

part.Touchedagain:Connect(onPartTouchedagain)

(yes i purposuely made the second part super bad to get u to fix lol)

But you should probably add debounce since touched can register many times in seconds

local part = script.Parent
local isFirstTime = true
local function onPartTouched(otherPart)
    local partParent = otherPart.Parent
    local humanoid = partParent:FindFirstChildWhichIsA("Humanoid")
    if humanoid then
		if isFirstTime then
			game.Lighting.Blur.Size = 56
			isFirstTime = false
		else
			game.Lighting.Blur.Size = 0
		end
    end
end

part.Touched:Connect(onPartTouched)