Unfortunately we cannot guarentee that. 60cm is at the very limit of what the VL6180 can do.
The solution is to do what I do when playing golf. Just over club it.
Choose a sensor that can range much farther. I'd suggest the VL53L4CD. It's our least expensive sensor and it can see people to 1.3M.
If you target is small, or particularly non-reflective you might not see it, but at 60cm, the VL53L4CD is a very good choice.
(The code is easy as well.)
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