Not if have you disabled usb debugging and unknown software in system setting and locked it through app locker.
It doesn't matter for Phone flashers that USB debugging is enabled or not...
recently my Gionee P2 was bricked with a boot issue (coz I flashed wrong recovery/boot img) and tried several adb commands to recover it but failed
so finally visited Gionee Service center (as it was in warranty) and to my surprise they installed stock OS within 30minutes

and I don't how they flashed it coz the device was not detected in PC (not via adb or any other command)
so professional engineers can flash a locked phone also