1. Little more back ground details were required in connection with the incidence to give proper answer to your query.
2. What interest the said person has on your house for putting the said lock?
3. Are you staying in that house with your family?
4. Do you know the said person and the reason for putting the said lock?
5. If you ae staying in that house and some one has just thrown prank on you by locking your door for no apparent reason, the break open the lock and report the matter to local police station.
6. If it has been done purposely by any of your known person for some reason, lodge a police complaint against him before the local police and if it repeats, report the matter to the local DC.
7. If police does not take any action, file a writ petition against police inaction seeking relief.