There's plenty of people to do work. People don't want to do your work, if the job sucks and the pay matches. Shitty job? Pay a high wage. We don't have a shortage of sanitation workers because those guys are paid like kings. We DO have a shortage of Burger King employees because not one person in the world wants to deal with that bullshit for less than $10 an hour. People have shown time and time again that they're willing to work the most soul crushing bullshit jobs in existence if they're paid well enough to make it worth their time. But no one wants to pay a wage that an employee can survive on, so "nobody wants to work". No, just nobody wants to work for you.

In addition to that, the reason the population is declining is because the younger generation can't afford to have kids because nobody wants to pay a livable wage. I can barely support myself and my partner with both of us working and living with another couple as roommates, and we all have pretty good jobs that pay well over minimum wage. If any one of the four of us had a child we would all four enter poverty. This is extremely common, and we're better off (if only moderately) than most people in a similar situation.

The minimum wage was last raised 14 years ago where it was taken to $7.25 an hour, which already didn't keep up with the cost of living at the time but since then inflation has continued to grow unchecked and many employers still don't want to pay out any higher than they are forced to by law.