After the garage door opener broke, I have been manually opening and closing my door, which I don't mind at all. Who needs a garage door opener? My question to you experts concerns the square holes in the frame for locking the door. There is a hole I use at night that locks the door when it is totally closed. But there is another hole I would like to use during the day that would lock the door when it it a foot or two opened. That way my cat can go in and out during the day. Yes, I am well aware of not leaving the door open like that at night, since the raccoons would have no reservations about coming in looking for cat food.
The only problem is that other hole is covered with a thin piece of metal, so I need to punch or cut out that piece of metal. Can I take a screwdriver and hammer and try to punch it out that way? I don't want to bend or damage the frame.

