I try to

alter user user_name account lock;
alter system kill session 'c_sid, c_serial';

from a procedure get error.
11/3 PLS-00103: Encountered the symbol "ALTER" when expecting one of
the following:
begin declare end exit for goto if loop mod null pragma raise
return select update while
<<
close current delete fetch lock insert open rollback
savepoint set sql commit


I assume I have to use dbms package to do it

Could anyone tell me which dbms package I can use?

thanks