code: def update_access_key(self, access_key_id, status, user_name=None):
          
          params = {'AccessKeyId' : access_key_id,
                    'Status' : status}
          if user_name:
              params['UserName'] = user_name
          return self.get_response('UpdateAccessKey', params)
docs: Changes the status of the specified access key from Active to Inactive
          or vice versa.  This action can be used to disable a user's key as
          part of a key rotation workflow.
  
          If the user_name is not specified, the user_name is determined
          implicitly based on the AWS Access Key ID used to sign the request.
  
          :type access_key_id: string
          :param access_key_id: The ID of the access key.
  
          :type status: string
          :param status: Either Active or Inactive.
  
          :type user_name: string
          :param user_name: The username of user (optional).