My Hotkey script that changing player's parameters is not working, wth?

Please, do not optimize it, just make it working. The problem is probably in wrong writing Capital letters? help pls. that script is a hotkey thing and im sure its right, the problem is in the writing the main part.

local m = game.Players.LocalPlayer:GetMouse()
local player = game.Players.LocalPlayer.Character.Humanoid
db = true
m.KeyDown:connect(function(k)
	k = k:lower()
	if k == "l" then
		if db == true then
			wait(0.1)
			player.WalkSpeed = 30
			player.Torso.Transparency = 0.2
			player.LeftArm.Transparency = 0.2
			player.RightArm.Transparency = 0.2
			player.LeftLeg.Transparency = 0.2
			player.RightLeg.Transparency = 0.2
			player.Head.Transparency = 0.2
			wait(0.1)
			player.WalkSpeed = 40
			player.Torso.Transparency = 0.4
			player.LeftArm.Transparency = 0.4
			player.RightArm.Transparency = 0.4
			player.LeftLeg.Transparency = 0.4
			player.RightLeg.Transparency = 0.4
			player.Head.Transparency = 0.4
			wait(0.1)
			player.WalkSpeed = 60
			player.Torso.Transparency = 0.6
			player.LeftArm.Transparency = 0.6
			player.RightArm.Transparency = 0.6
			player.LeftLeg.Transparency = 0.6
			player.RightLeg.Transparency = 0.6
			player.Head.Transparency = 0.6
			wait(0.1)
			player.WalkSpeed = 80
			player.Torso.Transparency = 0.8
			player.LeftArm.Transparency = 0.8
			player.RightArm.Transparency = 0.8
			player.LeftLeg.Transparency = 0.8
			player.RightLeg.Transparency = 0.8
			player.Head.Transparency = 0.8
			wait(0.1)
			player.WalkSpeed = 100
			player.Torso.Transparency = 1
			player.LeftArm.Transparency = 1
			player.RightArm.Transparency = 1
			player.LeftLeg.Transparency = 1
			player.RightLeg.Transparency = 1
			player.Head.Transparency = 1
			wait(0.5)
			player.WalkSpeed = 16
			player.Torso.Transparency = 0
			player.LeftArm.Transparency = 0
			player.RightArm.Transparency = 0
			player.LeftLeg.Transparency = 0
			player.RightLeg.Transparency = 0
			player.Head.Transparency = 0
			db = false
			wait(5)
			db = true
		end 
	end
end)

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