From what I've heard, it may be possible to get visas for working as a model or barista, but you'd have to have 3-5+ years of experience under your belt unless you're really lucky. In general, Japanese people are preferred when they have the skills, so you would have to stand out. As such, modelling is really the only option, and only if you're really good looking.

You might have heard that due to bad domestic and international economic circumstances, jobs are becoming harder to get - in cases like these, foreigners are almost always the first to go. You'll need to be going for some sort of job that makes you stand out; a job that would require at least a few years of tertiary education.