Electronics Repair Questions? Ask an Electronics Technician
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What model of Sentry Safe is it, please? a fire safe, a personal safe, a gun safe?
What does the safe do when you enter your code?
Does the safe's keypad show a light or lights at any time?
You may need to blow powdered silicone lubricant (lock lubricant or latch lubricant) into the latch... it sounds rather like a stuck latch impeding it from opening.