The minimum wage in Australia is around $26 gross per hour for daytime work.
Let’s say, you work in Hospitality and work weekends, you earn around $1200 gross per week. Take around 15% off for tax and you’ll take home ± $1000 per week, that's $4000-$5000 per month!
Of course the minimum wage applies to any job, so whether you work in Hospitality as waiter or as a kitchen hand, in child care, in agriculture or production work, you’ll get paid at least the minimum wage.