Webshots 5 can be used for your Lock Screen image using Windows 10. To set it up, right click your desktop and chose "Personalize"
Choose "Lock Screen" from the options on the left.
Choose "Picture" in the box below "Background" and click "browse".
Open your Documents folder and select the Webshots folder.
Within the Webshots folder you will see a Webshots Wallpaper folder. Chose any image from that folder and click Chose picture. That image will now become your Lock Screen image.