Why doesn't this work?

local cam = workspace.CurrentCamera
cam.CameraType = "Scriptable"
cam.CoordinateFrame=CFrame.new(-874.681, -337.064, 370.89)
cam.Focus=CFrame.new(-874.957, -337.348, 358.569)
function onButtonClicked() 
game.Workspace.CurrentCamera.CameraSubject = game.Players.LocalPlayer.Character.Humanoid
game.Workspace.CurrentCamera.CameraType = "Custom"
end 

game.Workspace.Play.SurfaceGui.Frame.TextButton.MouseButton1Click:connect(onButtonClicked) 

It focus's fine but then the button wont press... Btw This is a Surface Gui so i dunno Thanks in advance