Speed Script

game.StarterGui:SetCore('SendNotification', {
    Title = script.Name,
    Text = script.Name..' has loaded. Press and hold \'Shift\' to 🏃‍ and release to 🚶‍.',
    Duration = 10
})

-- Wait Function --
game:WaitForChild('Players')

-- Variables --
Player = game.Players.LocalPlayer
Character = Player.Character
Humanoid = Character.Humanoid
UserInputService = game:GetService('UserInputService')

function SetWalkSpeed(NewSpeed, Input, Processed,  Key1, Key2)
    if Player ~= nil then
        if Character ~= nil then
            if Humanoid ~= nil then
                if Input.KeyCode == Key1 or Input.KeyCode == Key2 then
                    Processed = true
                    Humanoid.WalkSpeed = NewSpeed
                    Processed = false
                end
            end
        end
    end
end

UserInputService.InputBegan:Connect(function(input, processed)
    SetWalkSpeed(30, input, processed, Enum.KeyCode.LeftControl, Enum.KeyCode.RightControl) -- replace '30' with whatever speed above 16
end)

UserInputService.InputEnded:Connect(function(input, processed)
    SetWalkSpeed(16, input, processed, Enum.KeyCode.LeftControl, Enum.KeyCode.RightControl) -- replace '16' with whatever speed below or at 16
end)