/Javascript/React/Back press subscriptions i is not a function react native

Back press subscriptions i is not a function react native

componentDidMount() {
        this.interval = setInterval(() => this.setState({ time: this.state.time + 1 }), 1000 * 60);
        this.handler = BackHandler.addEventListener('hardwareBackPress', () => {return true})
    }

    componentWillUnmount() {
        clearInterval(this.interval)
        this.handler.remove()
        BackHandler.addEventListener('hardwareBackPress', () => {return false})
    }

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