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unfortunately this is a known issue with the kit lens. You probably don't want to hear this answer but I haven't seen a workaround on this. You just have to focus on lights in the distance I'm afraid 😞
If I'm not mistaken, you can use focus magnifier and then a distance bar is shown!
I'm not sure if that's the case with the NEX portmixus. I know my little brother has one (not the 5) and it doesn't.
I don't have NEX 5 anymore, so you're probably right.
But it's perhaps useful info for others with newer models.
BTW you can either turn towards the infinity direction as a loop then stop. (and if necessary turn it a hair back). Works in practice for me.
You can also "learn" the behaviour of your lens in broad daylight, and see whether your lens goes beyond infinity or not.