I have set up a DMBS_JOB with the syntax below:

VARIABLE jobno number;
BEGIN
dbms_job.submit(:jobno,
'reset_nbr;',
SYSDATE, 'null');
END;
/

When I check data dictionary on DBA_JOBS, the job is on the queue. But somehow it is not executing. Am I doing anything wrong?
Also, is it possible to set the job to run at the specific time of the day?

Thank you in advance....