& @lock attribute2
 
  Note: you may lock against any attribute, but the locked object 
  must be able to read the attribute from the player attempting to 
  pass the lock or the lock will fail.
 
  Examples:
    > @lock men's room=sex:m*
    > @lock a-f=name:<g
    > @lock post office=email:*@*
  See also: ATTRIBUTE OWNERSHIP, @lock evaluation.