美国采购需求：数字柜锁、指纹抽屉锁、RFID储物柜锁、安全抽屉等。

I'm having trouble with my truck safe. After changing the battery, it opened once but now it won't unlock even though I know I'm using the correct combination that I've used successfully for the past four years. The lock beeps, but nothing happens when I try to open it. Can you please provide guidance on how to resolve this issue? Any troubleshooting tips or steps I can follow would be greatly appreciated. Thank you!