docs: def keyDown(key, pause=None, _pause=True):
      """Performs a keyboard key press without the release. This will put that
      key in a held down state.
  
      NOTE: For some reason, this does not seem to cause key repeats like would
      happen if a keyboard key was held down on a text field.
  
      Args:
        key (str): The key to be pressed down. The valid names are listed in
        KEYBOARD_KEYS.
  
      Returns:
        None
      """
      if len(key) > 1:
          key = key.lower()
  
      _failSafeCheck()
      platformModule._keyDown(key)
  
      _autoPause(pause, _pause)