How to let an "E" to pickup tool be dropped?

I tried copying the e to pickup script and changing it to press "m" to drop it but it doesn't work. help me!

*Local*
UIS.InputBegan:Connect(function(input)
    if game.Players.LocalPlayer.Character:FindFirstChild("KeycardLevel1") then
        if input.Keycode = Enum.Keycode.M then
            workspace.Items.Prop.Event:FireServers()
        end
    end
end)

*Server*
    **Forget the rest sorry**