cyrus-sasl and saslcache expire capability

The Cyrus-sasl comes with saslcache

usage: saslcache [options]

option information:
  -d             Dumps a csv list of information in the cache.
  -f             Purges all entries from the cache.
  -m <path>      Alternate path to the cache.mmap file.
                 Defaults to: /var/state/saslauthd/cache.mmap
  -s             Dumps general statistic information about the cache.

  All data is delivered to stdout

The option "-f" does not seem to be active or working?  Is there
another tool or a way to expire data that is in the cache - preferably
individually?

Thanks