Why wont this work?

local g = game.Workspace.GuiGive2

while true do
    for i,v in pairs(game.Players:GetChildren()) do
        if (v.Character.Torso.Position - g.Position).magnitude <= 10 and    v.PlayerGui.Teleport.Game.Visible == false then
                v.PlayerGui.Teleport.Game.Visible = true
        end
        if (v.Character.Torso.Position - g.Position).magnitude >= 10 and v.PlayerGui.Teleport.Game.Visible == true then
            v.PlayerGui.Teleport.Game.Visible = false
        end
    end
wait()
end

It's suppose to work so when someone comes near the brick it shows a gui