I tried adding a debounce "k" but the script still doesn't work help?

wait(.1)
p = game.Players.LocalPlayer
c = p.Character
RS = c.Torso["Right Shoulder"]
hold = false
mouse = p:GetMouse()
local size = 2
k = false

function charge(key)
	key:lower()
	if key == "e" then
		if k == false then
		k = true
		hold = true
		for i = 1,20 do
		RS.C0 = RS.C0 *CFrame.Angles(0,0,-.16)
		end
		h = Instance.new("Part")
		h.BrickColor = BrickColor.new("Pearl")
		h.TopSurface = "Smooth"
		h.BottomSurface = "Smooth"
		h.CanCollide = false
		h.Shape = "Ball"
		h.Parent = game.Workspace
		while hold == true do
		wait()
		h.Size = Vector3.new(size,size,size)
		size = size+.05
		h.CFrame = c.Head.CFrame*CFrame.new(1.5,2,0)
		h.Anchored = true
	end
	end
end
end
function release(key)
	key:lower()
	if key == "e" then
		hold = false
		h:Destroy()
		for i = 1,20 do
		RS.C0 = RS.C0 *CFrame.Angles(0,0,.16)
		end
		hs = Instance.new("Part",game.Workspace)
		hs.Size = Vector3.new(size,size,size)
		hs.TopSurface = "Smooth"
		hs.BottomSurface = "Smooth"
		hs.Shape = "Ball"
		hs.Name = "Kiblastthe"
		hs.BrickColor = BrickColor.new("Pearl")
		y2 = Instance.new("BodyVelocity",hs)
		y2.maxForce = Vector3.new(math.huge,math.huge,math.huge)
		y2.velocity = c.Head.CFrame.lookVector*52
	    hs.CFrame = c.Head.CFrame*CFrame.new(2,0,-6)
	    wait(.75)
		for i = 1,10 do
			wait()
			hs.Transparency = hs.Transparency +.1
		end
  		wait(.25)
		hs:Destroy()
		size = 2
		wait(.5)
		k = false
	end
end

mouse.KeyDown:connect(charge)
mouse.KeyUp:connect(release)
Anonymous