This script only works in studio?

Hey, ds here. I'm wondering why this double jump script (a LocalScript inside ServerScriptService) won't work in the real game. It only works in a normal script in Studio, and neither in the client.

local uis = game:GetService('UserInputService')


uis.InputBegan:connect(function(input,process)

    if not process then

char=game.Players.LocalPlayer
        if input.KeyCode == Enum.KeyCode.Space and game.Players.LocalPlayer.Character.Torso.Velocity.Y>0 and char.Jump.Value==0 then
    char.Jump.Value=1
    char=game.Players.LocalPlayer.Character
    char.Humanoid.Jump=true
    char.Torso.Velocity=Vector3.new(0,100,0)
    wait(.5)


    char=game.Players.LocalPlayer
wait(2)
    char.Jump.Value=0

            print('Double JUmped pressed')
        end
    end
end)

Help is appreciated!