Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
Please confirm the make and model number of the safe?
If the green light has come on then the batteries are ok.
When was the safe last opened successfully?
The mechanism may have jammed - you could try hitting the door with a rubber mallet to help loosen the lock mechanism, then apply some light lubricating oil to it once you get it opened.
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Hi, just checking in on your question, do you need any further assistance?