1. Use a hard card: You can try to use a hard card, such as a credit card or membership card, insert it into the door, and gently pry the lock tongue to make it come out of the card slot.

2. Use a screwdriver: If you have a screwdriver, you can try to unscrew the screw on the side of the door lock, which will loosen the lock tongue and then take it out.

3. Remove the door: If all the above methods fail, you can try to remove the whole door, so that you can take out the lock tongue. Please note that this requires corresponding skills and tools, and it is best to seek the help of professional locksmiths or repairmen.

No matter which method is used, please pay attention to avoid damaging the door lock or door. At the same time, make sure you have enough tools and skills to deal with this problem. If not, you'd better seek professional help.