How to Reactivate Apps User using API

I am using EBS 12.1.3 with DB version 12.1.0.2.0

I want to Reactivate Apps User using API but it is not working. I am using below API:

BEGIN

  fnd_user_pkg.updateuser(x_user_name => 'APPS_USER', X_OWNER => 'SEED',x_unencrypted_password => 'welcome@123', x_end_date => NULL);

END;