patch 6121372 Oracle Error ORA-28000: the account is locked

Ct trying to apply patch 6121372 and getting below error

AD Worker error:
The following ORACLE error:

ORA-28000: the account is locked



ATTENTION: All workers either have failed or are waiting:

FAILED: file b5918131.sql on worker 1.

ATTENTION: Please fix the above failed worker(s) so the manager can continue.

Current time is: Mon Jan 21 2013 20:53:13

Restarted: file b5918131.sql on worker 1 for product po username PO.

Connecting to PO......Unable to connect.

AD Worker error:
The following ORACLE error:

ORA-01017: invalid username/password; logon denied

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+ Have suggested to unlock the user and rerun the patch, this has not helped.
alter user apps account unlock ;