OMG, I would take them home and keep them as a pet. I would dress them up in dolls clothes and feed them lollipops. It would be so cute. I would put them in my pocket and take them everywhere. We would be best friends. I would take pictures of us and put them on the Internet and we would be as famous as grumpy cat. I'm not even kidding.
I'd feel kind of bad for them so I'd try and help them. If they were like some genius scientist who invented a shrink ray then I'd ask them about how they made it, see if they knew how to build one to reverse it. The technology would be very useful to me.
I guess I'd have to build them a base or something because insects are probably gonna be pretty lethal to them. I might try and make them some kind of weapon (lol, giving them a pin to use as a spear).
LOL I could buy a miniature quadcopter, make a tiny remote so they had their own flying machine!
Weigh them to see if they still have all the mass of a grown adult of normal size. See, that's the thing with, "Honey, I Shrunk the Kids." The way they explained it, they reduced the gap between electron fields and their nuclei. Well that doesn't explain their apparent reduction in mass. You might fit in a teaspoon, but your ass is still 167lbs.