code: def delete_value(self, key):
          
          response = {}
          response['status'] = False
          response['msg'] = "key does not exist"
  
          file_cache = self.read_file()
          if key in file_cache:
              del file_cache[key]
              self.update_file(file_cache)
              response['status'] = True
              response['msg'] = "success"
          return response
docs: Delete the key if the token is expired.
  
          Arg:
          key : cache key