Well I had this issue since bought this car zero meter. Contacted the Suzuki guys next day and they said "sir apki car new hay na so dooors abhi hard hain locks apni jagah bana lain gay. it will be OK with time"
3 saal guzar gaye or 40k km but locks be jagah nahi banai.
out of frustration i hit the kabar market(shershah, bilal gung, etc) and there i saw Australian Cultus (Holden Barina) front two doors. They were in very good condition i asked for the price of locks only and he quoted me Rs. 600 per lock with labour i agreed and changed the front 2 locks. From that day to this day, 3 years passed and they are running strong and noiseless.. They have a voice like thap thap , seems like you are closing the door of a japanese hatch back or local sedan like corolla.
SO bro you need to change its lock if you want to spend less power on closing the door and that cheap sound they create.