code: def owner_id(self):
      try:
          with self._soft_lock_path.open("r") as handler:
              return handler.read().strip()
      except FileNotFoundError:
          return None
  
imports: import os
  import logging
  import pathlib
  import threading
  import uuid
  import time
  from filelock import BaseFileLock, SoftFileLock, UnixFileLock, has_fcntl
  from cachetools.func import ttl_cache
  from psutil import disk_partitions
  from typing import Optional, Union, Dict, Set, Tuple
label_desc: Use image node_id 5 for calling the RefreshLock obj's underlying member method code with example usage: obj.owner_id() and returns: handler, None