What's up with solar/light sails?

Are solar sails feasible in the here & now, like satellites and
rockets?

Or are they more "for the future" like orbital tethers, space
elevators, etc., things that are possible in principle but have big
financial and technical hurdles yet to be ironed out?

I guess I want to know that, if NASA launched a solar sail satellite
into low Earth orbit today, could it sail its way up to higher orbits?

Has anyone ever launced a real solar sail?

Thanks,
John