估计LZ的锁已经开了。要是没开,可以试一试这万能钥匙,英文叫bumper key. 不过知到了这个秘密,可别吓得晚上睡不好觉了。有个朋友知道这个秘密后,每晚睡觉前都要拿几把椅子顶住门。
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We had a similar problem a while ago. There was a small metal pin inside the lock and it was broken. When pressing down the little handle as shown in the picture below (the lower part), it was time to time not functioning properly. End up we bought a new one to replace it. It costs a lot. But we could not find any better way to fix it.Lock