Can an electronic safe be opened without a key?

Are you talking about the hotel room safe? The safe can be opened without a key, which is divided into master password and guest password. When the guest password is forgotten, you can use the master password to open the safe. If your safe deposit box is dead, but locked, you can only open it with a key (unless your safe deposit box is equipped with an external power supply or decoder, advanced safe deposit boxes have these functions, such as Migu safe deposit box, you can open the safe deposit box without a key if you have an external power supply or decoder.