Key not coming out of ignition lock

Sir,
My maruti Suzuki Ritz automatic is creating issues from last one month. After driving car when it is parked key does not come out of ignition no matter of any technique applied. Even tried with new key. Howvever next day after starting car again and then after moving wheels it easily comes out. This problem had started after rear break shoes of car were changed at service center. Car till datr ran for 23000 Kms. Electrical lube already tried. What may be the reasons and any risk associated? Also can the gps device tracker attached to immobolizer be responsible for it as only during last month my GPS device SIM got deactivated.