How to read lines from file asynchronously and work with them in gather?

I'm trying to replace list of generated numbers with asynchronously reading them from file. How can I do it right?

from asyncio import get_event_loop, gather, sleep
import aiofiles


async def read_file():
    async with aiofiles.open('test.txt', mode='rb') as f:
        async for line in f:
            yield line


async def main(k):
    print(k)
    await sleep(1)


if __name__ == '__main__':
    count_group = 3
    list_objects = list()

    for i in range(1, 11):
        list_objects.append(i)

    loop = get_event_loop()

    # TODO How to correctly replace list_objects with read_file()
    list_func = [main(x) for x in list_objects]

    run_groups = [list_func[i:i + count_group] for i in range(0, len(list_func), count_group)]
    for rg in run_groups:
        loop.run_until_complete(gather(*rg))

I tried different options but none of them work. My goal is to asynchronously read lines from file and work with them.

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