[389-users] Password Expiration Time

I am using php to change the password for my ldap users, and now I am trying to enable the password expiration policy But when I enable it, most of the users became blocked users because they did not change their password recently. I want to unlock them using php or ldap automatically.. what are the attributes needed to solve this problem? I tried to reset passwordexpirationtime to be in the future for all of them, but this did not work to unblock them Any help please? Thanks