Yours are too young to molt.
This not laying thing has been a thing this year for a lot of ppl. There was a thread about it and a bunch of ppl were complaining about it; not just newbs like me either, ppl who've been chicken-ing for 15 years or more have been saying that they're not getting half as many eggs as they should for the hens they have, even considering it's winter.
Just keep things healthy and consistent for them and they'll start laying.
What breed(s) do you have?
Some breeds lay better in the winter than others.
I have 3 Speckled Sussex hens and 1 Dark Cornish hen. Still only getting 1 egg a day, but check out the egg I got today!