How to set button click event with kotlin 2

MainActivity.kt

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        findViewById<Button>(R.id.btn1).setOnClickListener {
            Snackbar.make(it, "ボタン１が押されました", Snackbar.LENGTH_SHORT).show()
        }
    }
}