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It's always worth remembering that any locking mechanism can be overridden, it just takes a bit of research to find out how. People have in the past cloned keys, for example. Look at the whole Kryptonite Biro disaster; it illustrates how easily blatant vulnerability can be missed, and up from that extreme there are many other less obvious weaknesses.
Of course, there are also ways of breaking something quietly. If a thief can come prepared because they've been able to suss something out in advance, and what they've planned works, it can be a very quick in and out.
Also always worth repeating for anyone who might not yet know it is that most bike thefts occur from in and around the home, particularly gardens and sheds.
Really sorry to hear this. Which Asgard locker was it? I thought the only way you'd be able to get into one of them would be with power tools so you'd think the noise would disturb you.