Green’s Dictionary of Slang

(US) to break open a door or lock in some illicit manner.

1970		J. Wambaugh New Centurions 302: Roy saw that the molding had been pried from the door with a quarter-inch screwdriver which was then used to easily shim the door.
1979		‘Iceberg Slim’ Airtight Willie and Me 58: Streak had a fear that some shuffler would shim his pad.