docs: def generate_key(self, force=False):
          """
          Creates a key file for this TaxPayer
  
          Creates a key file for this TaxPayer if it does not have one, and
          immediately saves it.
  
          Returns True if and only if a key was created.
          """
          if self.key and not force:
              logger.warning(
                  'Tried to generate key for a taxpayer that already had one'
              )
              return False
  
          with NamedTemporaryFile(suffix='.key') as file_:
              crypto.create_key(file_)
              self.key = File(file_, name='{}.key'.format(uuid.uuid4().hex))
              self.save()
  
          return True