Bike U-lock removal (key broke inside)

Hello, My key broke inside the lock in front of my house. I couldn't remove the key and drilled into the keyhole to try breack the springs, however my drill was not appropriate for the task. I think removing the key is no longer an option after the drilling. As such, the two ways that the lock can be removed are IMO: drill into the keyhole with a proper drill, or cut the U lock with a proper radial handsaw. The lock can be seen in the back right of the image