Code:
SQL> select account_status from dba_users where username='THOMAS';
ACCOUNT_STATUS
--------------------------------
OPEN
SQL> alter user thomas account lock;
User altered.
SQL> select account_status from dba_users where username='THOMAS';
ACCOUNT_STATUS
--------------------------------
LOCKED
SQL> alter user thomas account unlock;
User altered.
SQL> select account_status from dba_users where username='THOMAS';
ACCOUNT_STATUS
--------------------------------
OPEN
SQL> alter user thomas password expire;
User altered.
SQL> select account_status from dba_users where username='THOMAS';
ACCOUNT_STATUS
--------------------------------
EXPIRED
SQL> alter user thomas identified by thomas;
User altered.
SQL> select account_status from dba_users where username='THOMAS';
ACCOUNT_STATUS
--------------------------------
OPEN
Otherwise. no way...
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