Unlock user via DB update
With this function you can unlock users - also in another client than the one that is used for this function - via database update. It could be the salvation in case every user was accidentally locked out in a client. There is no standard function available in an SAP system to help you out.
For this function also system users (type B, C) can be used. As removing the lock flag will be done via database update the authorization designated for this purpose (S_USER_GRP) is not necessary.