Just thinking out loud.

The storage area is a good idea as long as there is electricity, loose it and the computer that reads your entry code or card is off. And the power gate will not open. And the person that runs the place may have bugged out or if they are there they may not let you in without being able to confirm you have a right to be there (and this would require the computer that’s not working.)

This may leave you without food & survival items and the dilemma of deciding if you should break into the storage place. This would be illegal I’m sure and may make you the focus of the police who may consider you a looter. And at the very least you would be taken away for questioning and probably be charged for trying to break in.