public Parser unlockStatement() {
        if (unlockStatementParser == null) {
           FutureParser future = scoped("unlockStatement");
           unlockStatementParser = future;
           future.setParser(
               sequence(
                   token("UNLOCK"),
                   fileName(),
                   optional(
                       choice(
                           token("RECORD"),
                           token("RECORDS")
                       )
                   )
               )
           );
        }

        return unlockStatementParser;
    }