With the birds as they love scratch, start sitting on the ground and start with scratch in a cup or scooper or bowl you push out at arms length and use a command like "come" or whistle like you would for a dog to come, or say "treat".... just sit let them come and eat... over time, and do not rush this at all, move the treat closer to you, stay calm, just chat with them, read a book, breath but let them come closer on their own very gradually... eventually start holding scoop or cup at length so they must get closer to hand, but are already used to eating in presence, but again go from far away to slowly closer to you... then transition to feed in hand held way out, always sitting calmly, if they won't take from hand put on ground next to hand, no short cuts take every step as a stage of far to closer over time... try dried worms or dried little fish (Asian markets) too... my girls love meat... want to watch some fun toss meat scraps out... the birds go nuts, also mine like noodles, cottage cheese, fresh veggies, shredded watermelon rinds, and more. I taught my birds to "go home" meaning into their coop by saying that nightly and giving a food reward... the up is if I really need them in coop sooner say full light out, they will do it while complaining to me that it is not night time yet... but they will reluctantly go in their coop... and get their treat. Means less chicken herding work for me and a slow march instead to coop.