You actually need to have access to the laptop to be able to unlock the files. However, if the screen is broken, simply connect a monitor through the VGA or HDMI adapter available on almost all laptops. This way you will have access to the computer's desktop even if its main screen is broken. There is no other possibility except this one and connecting a monitor to one of the mentioned ports, is the easiest thing to do if the other parts of the laptop are intact and working.