i found a lock lying around....pictures below...


Sorry if they're blurry, but the text says '40mm' and 'Made in China' (both very helpful I'm sure).
Anyway I can't seem to set a pin...I'm beginning to think it's me. I can push it up but no matter how fast, flow, hard or soft I seem to do it, it comes right back down. There's definitely pins in there, I can see them...they just won't stay put.
Is this lock just out of my league for a first lock? Am I missing something really basic?
I did search for 'how do you set a pin' but came up with 216 pages of threads.