With a job you can invest little bit every month in bitcoin and if bitcoin continues to steadily rise every month by 10% or something then you would get 10% profit every month from what you have in and put in but ofcourse it wont rise steadily like that but if you count how it rises over time then its almost the same.
This is what most likely the OP wants, a steady income without doing anything, since OP said he wants it "small & secure"...unfortunately you won't earn 10% each month from saving bitcoin since the price increase fluctuates, so for sure that 10% won't be consistent and won't be earn monthly. I wonder what way the OP is doing now?