private MemcachedClientIF getClientFromPool() {
        return FunctionUtils.doUnchecked(this.connectionPool::borrowObject);
    }
If not time out value is specified, expire the ticket immediately.

@param ticket the ticket
@return timeout in milliseconds.
support/cas-server-support-memcached-ticket-registry/src/main/java/org/apereo/cas/ticket/registry/MemcachedTicketRegistry.java