svn help lock
lock: Lock working copy paths or URLs in the repository, so that
no other user can commit changes to them.
usage: lock TARGET...

  Use --force to steal the lock from another user or working copy.

Valid options:
  --targets arg            : pass contents of file ARG as additional args
  -m [--message] arg       : specify lock comment ARG
  -F [--file] arg          : read lock comment from file ARG
  --force-log              : force validity of log message source
  --encoding arg           : treat value as being in charset encoding ARG
  --username arg           : specify a username ARG
  --password arg           : specify a password ARG
  --no-auth-cache          : do not cache authentication tokens
  --non-interactive        : do no interactive prompting
  --config-dir arg         : read user configuration files from directory ARG
  --force                  : force operation to run