Oh this is such an easy problem to solve! And it will take practically no time to start working every single time you do it.
Here's what you do to make it simple to "catch" your chickens. Start off with a small container, something that will fit in your pocket for convenience, and fill it with meal worms. In fact, if you do not have meal worms on hand, go to an aquarium or pet store and buy a small carton of them, being prepared to pay the rich price, and keep the container.
Every time you want the chickens to come to you, show them the container, then pass out some of the worms. They will very quickly associate the container with a treat they can't resist.
I keep a small carton of meal worms always handy just for this purpose. Sometimes I don't have time to grab the carton, needing to catch a chicken right away. All I have to do is cup my hand while making a motion like I'm picking some delicacy out of my hand with the other one. The chickens come running up to me even though I have nothing in my hand.
When it comes to treats, chickens are really easy to manipulate.
If you don't already raise your own meal worms, you might consider it. They're very expensive, and so easy to raise. It's something anyone can do, and it's even a lot of fun.