Any lock will fail after it's been beat on enough. Locks are tiny bits of close tolerance steel parts carefully fitted together.
However, if real world study is important, then trainers are something that will be used eventually up and replaced. Some just last longer than others.
We made special delica trainers for a while for an excellent artist and trainer in the Northwest. He trained and taught enough that he could count how long the trainer's locks would hold up before they failed and had to be replaced.
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