I run @apxchpwd.sql and unluck the account with this script
alter session set current_schema = APEX_050100;
declare
l_workspace_id number := apex_util.find_security_group_id (p_workspace => 'INTERNAL');
begin
wwv_flow_security.g_security_group_id := 10;
apex_util.set_security_group_id (p_security_group_id => l_workspace_id);
wwv_flow_fnd_user_api.UNLOCK_ACCOUNT('ADMIN');
commit;
end;
But it doest work. Thanks for any help

The apxchpwd.sql script is used to change the password, but it also unlocks the ADMIN account (, so - you shouldn't even need any additional code. Just make sure to run the one that belongs to Apex version you use.
SQLPLUS /NOLOG
SQL> CONNECT SYS AS SYSDBA
SQL> @APXCHPWD
Alternatively, also connected as SYS, use the following code:
BEGIN
apex_util.set_security_group_id(p_security_group_id => 10);
apex_util.unlock_account(p_user_name => 'ADMIN');
END;
/
COMMIT;
Here is another solution that worked for me if the above didn't work for you : credit to : https://ora01948.wordpress.com/2017/12/19/unlock-apex-admin-account/
run the below script noting that Oracle APEX schema name can be different in my case it's
Apex_050000 so check your schema name first and change it accordingly .
`UPDATE Apex_050000.Wwv_Flow_Fnd_User
SET Web_Password = 'set_new_password'
WHERE User_Name = 'ADMIN'
AND Security_Group_Id = 10;
COMMIT;`
now change the session
ALTER SESSION SET CURRENT_SCHEMA = Apex_050000;
and run the below script to unlock the account .
BEGIN
Wwv_Flow_Security.G_Security_Group_Id := 10;
Wwv_Flow_Fnd_User_Api.Unlock_Account ('ADMIN');
COMMIT;
END;
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