This video explains how to open a cheap digital safe if the batteries have run down and you don’t have the key. It is destructive but these safes are about £30 online. This is is a good solution if you have not got the combination or your batteries have gone flat.
Here’s a link to a suitable pair of mole grips:
Here’s another £30 replacement safe:
You may be interested in my new channel, The Artful Bodger: