Couchbase server has a keyed unlock command, which goes along with the getl command. The PHP client needs to add support for this command. Support is being added to libcouchbase.
Sergey Avseyev
added a comment - Unlock command already available in libcouchbase https://github.com/couchbase/libcouchbase/blob/1.1.0dp5/include/libcouchbase/couchbase.h#L305-L346