so, what might an actual socialist say about something like a "jobs guarantee", or, as it is sometimes referred to by left-capitalists, "full employment"?
well, let's begin by understanding that labour is a commodity like anything else, and a capitalist always seek to reduce costs by any means in order to maximize profit. so, the capitalists - here, meaning those that own capital - are constantly seeking to reduce the cost of labour in order to maximize their own profits, that's just what capitalism is. and, this is what the class war is about: workers needing to band together to find ways to stop capitalists from exploiting them, which they will do in ever increasingly surreal ways if left to their own devices. there are no good capitalists - the game is that you cheat and lie and steal to get ahead.
as labour is a commodity, and capitalists seek to reduce it's cost, the law of supply and demand dictates that they ought to desire there to be a surplus of labour. when there is a deficit of labour, as there was after the small pox epidemic in america or after the plague in europe, then the price of labour goes up, which cuts into profit. capital wants to avoid this by always ensuring that there are more people than are required to do the jobs that need to be done for the society that exists around us to flourish.
(as an aside, an understanding of this is a part of the reason i don't work. if the capitalists want there to be more people than are required, then i'll volunteer to be surplus labour and go do something else, instead.)
how does capital ensure that it is maximizing it's own interests in creating a labour surplus? the answer to that question is via government regulation. through direct or indirect financing, the interests of capital (largely articulated through banking institutions) will do something called "capture" the government to behave in it's interests. that is, they work via systems of bribes and incentives, as well as through the revolving door. immigration policy in the united states (as well as in canada) has long been designed by the interests of capital to encourage excess amounts of immigration in order to reduce the price of labour. establishment politicians will then hold on to power by blaming the immigrants for "stealing jobs" and suppressing wages, in order to distract from the fact that the system is designed this way - this is what the capitalists actually want.
so, do you use government regulation to ensure a job guarantee? well, it's hard to make sense of such a thing, when you understand that the way it actually works is that the banks use government regulation as a tool to suppress wages with.
socialism does indeed call for full employment, but it does so not as a human right but as a consequence of the abolition of property. it is only when we take collective control of the means of production, that is when we abolish capitalism, that it will make sense to talk about full employment.
so long as the banks control the government via what is called "regulated capitalism", you will never see a jobs guarantee. it doesn't make sense within the constructs of the existing economy.