It can still work if it’s a small business, fast food or certain blue collar work. I’ve done it a few times in my life the last time was 2 years ago, I walked in and asked for a job as an EMT 2 months ago but I did need a certification for that. Recently I got hired for a new position but not the one I really wanted so as soon a I got hired I walked in to the hiring manager for the position I really wanted and asked for that job, to be continued.