title: lock keys and release keys based on a button press using PySimpleGUI and pyhook
body: <p>I have created a program where the user get access to the system keys such as ctrl and alt only with exiting a program with a button press. However when i run the program it does get stuck in the UI and wont allow me to do anything. Where am i wrong in this? Thanks in advance.</p>
  <pre><code>import PySimpleGUI as sg
  import pyWinhook
  import pythoncom
  
  layout=[[sg.Button('Exit')]]
          
  def blockKeys(event):
      if event.Key.lower() in ['lwin', 'tab', 'lmenu']:
          return False    # block these keys
      else:
          # return True to pass the event to other handlers
          return True
  
  def releaseKeys(event):
      return True
          
  window = sg.Window('Window Title', layout, no_titlebar=True, location=(0,0), size=(800,600), keep_on_top=True).Finalize()
  window.Maximize()
  hm = pyWinhook.HookManager()
  hm.MouseAll = releaseKeys
  hm.KeyAll = blockKeys
  hm.HookMouse()
  hm.HookKeyboard()
  pythoncom.PumpMessages()
  
  while True:
      event,values = window.read()
      print(event,values)
      
      if event =='Exit':
          hm = pyWinhook.HookManager()
          hm.MouseAll = releaseKeys
          hm.KeyAll = releaseKeys
          hm.HookMouse()
          hm.HookKeyboard()
          pythoncom.PumpMessages()
          break;
  
  window.close()
  </code></pre>