How to extract data from Samsung S5 with broken screen+digitizer?
Actually firstly when you connect your phone to pc it will show your phone icon and drive but it will empty until you will unlock your phone and that you can't do.

if you have enabled usb debugging than you can backup your files via adb.
use following adb command after connecting to adb terminal and listing your device is adb.
type:- 

"adb pull /storage/sdcard0/ C:\to_folder_where_you_want_t0_copy"

Have a great day