I have several tubular locks, varying from reasonably wide like this one, to almost impossible to get even a pick in.
If the spacing is narrow but still allows you to put a pick in (or these split pins), then you can just use longer pins so that only the pins touch the lock.
This will require an additional tension wrench to turn the plug, but it shouldn't be too difficult.
I think on most regular locks you can make a similar setup though, you just might need a different key since this key is pretty fat
Instead of the split pens you could also use staples. These are thinner and just as cheap (cheaper actually)
I'm by no means an expert in lock picking, but this is fairly straight forward