def expire_hit(self, hit_id):
try:<EOL><INDENT>self.mturk.update_expiration_for_hit(HITId=hit_id, ExpireAt=<NUM_LIT:0>)<EOL><DEDENT>except Exception as ex:<EOL><INDENT>raise MTurkServiceException(<EOL>"<STR_LIT>".format(hit_id, str(ex))<EOL>)<EOL><DEDENT>return True<EOL>
Expire a HIT, which will change its status to "Reviewable",
        allowing it to be deleted.