If the key pad entry works you may have bent the live action locking bolts (this happens if you try to close the door with bolt still extended – they can be bent by running into the body of the safe if the door is closed too hard with the bolts out). Make sure you have retracted the bolts before trying to close the door.
If the keypad entry does not work, please contact Stack-On’s Customer Service department at 847.665.1602 (Monday to Friday 6:00 am – 4:00 pm Pacific).