I need the player to move backwards from the way there facing?

I need the player to move backwards from the way there facing? But this script doesn't work, any fix's?

[Short] Local Script:

    for i = 1,14 do
        wait(0.01)
        local x = game.Workspace[Player.Name].HumanoidRootPart.Position.X
        local y = game.Workspace[Player.Name].HumanoidRootPart.Position.Y
        local z = game.Workspace[Player.Name].HumanoidRootPart.Position.Z
        wait(0.01)
        game.Workspace[Player.Name].HumanoidRootPart.CFrame = CFrame.new(Vector3.new(x,y,z +0.5))
    end

[Full] Local Script:

wait(3)
--Varibles
local InputService = game:GetService("UserInputService")
local timestamp = tick()
local doubleClickKey = Enum.KeyCode.S
local Player = game.Players.LocalPlayer
local Character = Player.Character
local Humanoid = Character:WaitForChild("Humanoid")

--Function
local function doublePress()
    --Walkspeed
    game.Workspace[Player.Name].Humanoid.WalkSpeed = 0
    wait(0.01)
    --Animation
    local Animation = Instance.new("Animation") -- create a new animation object
    Animation.AnimationId = "rbxassetid://2554941606"
    local Track = Humanoid:LoadAnimation(Animation)
    Track:Play()
    --MovePlayer
    for i = 1,14 do
        wait(0.01)
        local x = game.Workspace[Player.Name].HumanoidRootPart.Position.X
        local y = game.Workspace[Player.Name].HumanoidRootPart.Position.Y
        local z = game.Workspace[Player.Name].HumanoidRootPart.Position.Z
        wait(0.01)
        game.Workspace[Player.Name].HumanoidRootPart.CFrame = CFrame.new(Vector3.new(x,y,z +0.5))
    end
    Track:Play()
    for i = 1,14 do
        wait(0.01)
        local x = game.Workspace[Player.Name].HumanoidRootPart.Position.X
        local y = game.Workspace[Player.Name].HumanoidRootPart.Position.Y
        local z = game.Workspace[Player.Name].HumanoidRootPart.Position.Z
        wait(0.01)
        game.Workspace[Player.Name].HumanoidRootPart.CFrame = CFrame.new(Vector3.new(x,y,z +0.5))
    end
    game.Workspace[Player.Name].Humanoid.WalkSpeed = 16
end

--Function2
InputService.InputBegan:Connect(function(input, processed)
    if input.KeyCode == doubleClickKey and not processed then
        -- Same logic
        if tick() - timestamp <= 0.2 then
            doublePress()
        else
            timestamp = tick()
        end
    end
end)