Try using the bypass lock probably located on the transmission hump.  Insert
your key, maybe turn it, and the transmission unlocks.

You can get a battery charger and charge the battery or use long jumper
cables or use one of the portable jumper systems or use the shift lock
bypass if you want to shift the transmission out of park.

To use the shift lock bypass, somewhere on the shift console will be a small
plastic rectangular tab.  Pull the tab off and insert a key or screwdriver
into the opening.  While pushing down on the key or screwdriver, you should
be able to shift out of park.

You can't carry a new battery into the garage?

David