Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
If you are using the correct combination but the safe won't open, then the lock mechanism may have jammed.
When was the safe last successfully opened?
Try hitting the door several times with a rubber mallet around the lock mechanism area to help loosen it up, then try opening the safe again.
Let me know if that works?
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