Yeah there is no such thing as a magical investment that does not require work. The only investment that will really pay off is one that actually produces extra money. Like a business. Or the risky ones like stocks.
I've gotten into stocks a bit myself, but I don't really plan to break bank with it, I put a bit of money into it now and then but would not trust myself with my life savings.
Now days what sucks is that costs of living are going up at such a fast rate that no investment will even come close to keeping up. I have about 20k saved up in RRSPs so far, that is barely enough to last a year let alone retire on. I presume by the time I retire all my bills will be like 5x what they are now. Everything keeps going up and the little extra I get from interest is not going to make up for that.
That said, mutual funds are probably a half decent place for investments as they are rather safe and will grow more than a standard savings account. But yeah don't expect to break bank on any investments like that. If it was that easy everyone would retire, take out a 100k loan and invest it.