It seems that Lava Iris 408e is an Android device which uses Android OS 2.3. If you locked it, due to many wrong pattern attempts or for some other reason, you can unlock it through the mail address that you used to register the product on Google Store. However, this can be done only if you had activated Internet connection before the lock. If none, the only way to unlock it is by performing a hard reset. This will wipe all your data from the device, but you will be able to use it again. To do this, turn OFF your phone. After a few seconds, turn it ON and press the Volume Down button and the Power button in the same time for 10 - 20 seconds. By doing this, you will get access to the recovery menu, from which you need to choose wipe data / factory reset. After you did this, the phone should be rebooted and you will be able to use it again.