Why is my character not crawling?

I can't make the avatar crawl. I have put this script in StarterPlayer.StarterCharacterScripts and have an Animation inside of it. I am not having any warnings/errors. Here is my code

local UserInput = game:GetService("UserInputService")
local Player = game.Players.LocalPlayer
Player.CharacterAdded:wait()
local function WaitForChildOfClass(parent, class)
    local child = parent:FindFirstChildOfClass(class)
    while not child or child.ClassName ~= class do
        child = parent.ChildAdded:Wait()
    end
    return child
end
local Animator = Player.Character:WaitForChildOfClass("Humanoid"):WaitForChild("Animator")
local AnimationTrack = Animator:LoadAnimation(script.Animation)
local CrawlSpeed = 8
UserInput.InputBegan:Connect(function(Input, GameProcessed)
    if not GameProcessed and Input.UserInputType == Enum.UserInputType.Keyboard and Input.KeyCode == Enum.KeyCode.C then
        AnimationTrack:Play()
        Player.Character.Humanoid.WalkSpeed = CrawlSpeed
    end
end)
UserInput.InputEnded:Connect(function(Input, GameProcessed)
    if not GameProcessed and Input.UserInputType == Enum.UserInputType.Keyboard and Input.KeyCode == Enum.KeyCode.C then
        Player.Character.Humanoid.WalkSpeed = 16
        AnimationTrack:Stop()
    end
end)

Why is this not working? Any help would be greatly appreciated. Thanks!