Trouble with spiral folding bike lock - jammed
Jiggle it, wiggle it, slap it around a little.  The latch part is probably not retracting when it should.   You can also blast the lock with a penetrating lubricant and repeat the jiggle/wiggle/tap.

You could try contacting Rock Bros at http://www.rockbrosbike.com/article-info.php?artid=6   for advice and possible replacement.

Its slightly disconcerting that their email addresses are given as 
rockbrosbike@gmail.com and rockbrosbike@hotmail.com

Is your bike locked up somewhere else?   I'd recommend you go and add more locks to it until this one is removed.  If you give up, use a grinder to cut the lock completely and throw it away.