Why is UserInputService not working?

local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local UserInputService = game:GetService("UserInputService")

UserInputService.InputBegan:connect(function(input)
    if (player.Character.Torso.Position - script.Parent.Position).Magnitude <= 10 then
        if input.KeyCode == Enum.KeyCode.F then
            game.Players[player.Name]:WaitForChild("Hunger").Value = game.Players[player.Name]:WaitForChild("Hunger").Value -5
            script.Parent:Remove()
        end
    end
end)

From my last 2 questions, I got some wiki links, but I am still not that good of knowing how to do these.
Details: -This code is stored in a LocalScript -The LocalScript is in a part in the workspace -This script doesn't work? -I want the player to be within a range of 10 of the item, and if F is pressed, it removes 5 from your value and removes the parent.

Help? Thanks