Not sure how those locks work but if its solenoid action then this might work.
Solenoid power comes from voltage. If you can "hot shot" the latching mechanism then you can increase the mechanical power by a HUGE factor. Don't know how many batteries it uses, if they are in series or parallel. But if you understand how (or know someone who does) you can build a quick hot shot from batteries at say twice the voltage, and give it a shot.
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