code: def access_key(self) -> Any:
      self._refresh()
      return self._access_key
  
imports: import logging
  import os
  import threading
  import time
  from typing import Any
  import boto3
  from botocore import session
  from botocore.compat import ensure_unicode
  from botocore.credentials import CredentialProvider, Credentials, ReadOnlyCredentials, SharedCredentialProvider
  from botocore.session import get_session
label_desc: Use image node_id 8 for calling the RefreshableSharedCredentials obj's underlying member method code with example usage: obj.access_key() and returns: self