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Sentry safe locked with door open.
It should be noted that this kind of sentry safe is designed specifically to protect against fire damage not burglars with rare earth magnets in socks.
What can sometimes happen if locked when the door is open is that the rods are able to travel a lot further than they do normally and can get stuck.
You could thry a light tap with a hammer as you unlock it.
Open the door of the safe and ensure those shipping screws have been removed if any find the combination code on the user manual usually there is a sticker on the user manual if you are using a dual key combination model of.
To open a sentry safe with combination you can follow the below steps.
Try looking for a small plastic button on the hinge side of the door push it in after the combo it is a deadlock type of feature.
You could try a little graphite into the mechanics of the bolts to see if you can free them.
Other safes including most gun safes on.
The lock must have jammed.