Shift To Sprint

local userInput = game:GetService("UserInputService")
local players = game:GetService("Players")

local sprintSpeed = 30
local walkSpeed = 16

local player = players.LocalPlayer

local function beginSprint(input, gameProcessed)
 if not gameProcessed then
  if input.UserInputType == Enum.UserInputType.Keyboard then
   local keycode = input.KeyCode
   if keycode == Enum.KeyCode.LeftShift then
    player.Character.Humanoid.WalkSpeed = sprintSpeed
   end
  end
 end
end

local function endSprint(input, gameProcessed)
 if not gameProcessed then
  if input.UserInputType == Enum.UserInputType.Keyboard then
   local keycode = input.KeyCode
   if keycode == Enum.KeyCode.LeftShift then
    player.Character.Humanoid.WalkSpeed = walkSpeed
   end
  end
 end
end

userInput.InputBegan:Connect(beginSprint)
userInput.InputEnded:Connect(endSprint)