Why won't this local script work, It's supposed to change speed?

I made this local script where it changes the speed of the player when equipped, unequipped, and activated but it doesn't work. Any help?

local plr = game.Players.LocalPlayer
local char = plr.Character or plr.CharacterAdded:wait()
local humanoid = char:WaitForChild("Humanoid")
local tool = script.Parent

function slowdown()
    humanoid.Walkspeed = 100
end

function freeze()
    humanoid.Walkspeed = 0
    wait(0.67)
    humanoid.Walkspeed = 10
end

function speedup()
    humanoid.Walkspeed = 16
end

tool.Actived:connect(freeze)
tool.Equipped:connect(slowdown)
tool.Unequipped:connect(speedup)