Work at getting them used to a treat tin or pot that rattles when there's grain in it! Mine come running if they see the pot, and if I need to get them into the run, a good shake & rattle fetches them from all corners of the garden.
If I needed to put them to bed early (& 4 or 5 does seem quite early at this time of year), I'd attract them with the rattling grain pot, then toss some into the coop and watch them playing who can get in first!
Alternatively, I'd go with the suggestion of electric fencing, then they can work to their body clocks. I have electric fence round my run and it took the dogs 2 or 3 days to decide chickens weren't very interesting.
Here's a copy of a write up about electric fences: I've seen it elsewhere, but only copied it from one source!
"Study on Fox predation on Lesser Tern Colony,
"Tracks and scats of the foxes were first noticed near the colony on 28th. May, and almost daily thereafter. On 18, 19, and 20th. June, observers recorded that the incubating terns seemed "skittish, nervous and uneasy." This phenomenon was first thought to be associated with hatching but no chicks were noted. Nest numbers decreased from 138 to 129 on 20th. June, to 61 on 22nd. June. By 23rd. June only 45 tern nests remained. Fox tracks crisscrossed the colony.
On 24th. June the electric fence was erected. On 25th. June we noted a slight increase to 48 nests; a week later, 2nd. July, we counted 60 nests, and by 6th. July, 85 nests. Fresh fox tracks were seen near the colony, but they never came closer than 10 ft to the electric fence, no tracks were found in the trial area. New nests outside the fence were consistently taken by the Foxes-none survived." At the end of the trial the fence was turned off and for over two weeks the tracks never crossed it.
Unfortunately due to fox predation they suffered heavy losses and only one young fledged. The following year an electric fence was erected around the nesting site and this proved extremely effective at excluding foxes, so that 31 pairs reared a record 29 young. "