try this:

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class InputTester : MonoBehaviour {
    int choice = -1; // valid choices for this example are 0 and 1

    void Start() {
        StartCoroutine(DoSomeLogic());
    }

    IEnumerator DoSomeLogic() {
        print("Starting...");
        print("Awaiting your choice - 0 or 1. :: ");
        yield return StartCoroutine(WaitForKeyDown(new KeyCode[] { KeyCode.Alpha0, KeyCode.Alpha1 }));
        print("Continuing...");
        switch (choice) {
            // logic based on the choice
        }
    }

    IEnumerator WaitForKeyDown(KeyCode[] codes) {
        bool pressed = false;
        while (!pressed) {
            foreach (KeyCode k in codes) {
                if (Input.GetKey(k)) {
                    pressed = true;
                    SetChoiceTo(k);
                    break;
                }
            }
            yield return null; //you might want to only do this check once per frame -> yield return new WaitForEndOfFrame();
        }
    }

    private void SetChoiceTo(KeyCode keyCode) {
        switch (keyCode) {
            case (KeyCode.Alpha0):
                choice = 0;
                break;
            case (KeyCode.Alpha1):
                choice = 1;
                break;
        }
        print(choice);
    }
}

try this, you simply give the WaitForKeyDown coroutine a list of keys to check, once it registers a key, it will exit the checking loop & terminate:

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class InputTester : MonoBehaviour {
    int choice = -1; // valid choices for this example are 0 and 1

    void Start() {
        StartCoroutine(DoSomeLogic());
    }

    IEnumerator DoSomeLogic() {
        print("Starting...");
        print("Awaiting your choice - 0 or 1. :: ");
        yield return StartCoroutine(WaitForKeyDown(new KeyCode[] { KeyCode.Alpha0, KeyCode.Alpha1 }));
        print("Continuing...");
        switch (choice) {
            // logic based on the choice
        }
    }

    IEnumerator WaitForKeyDown(KeyCode[] codes) {
        bool pressed = false;
        while (!pressed) {
            foreach (KeyCode k in codes) {
                if (Input.GetKey(k)) {
                    pressed = true;
                    SetChoiceTo(k);
                    break;
                }
            }
            yield return null; //you might want to only do this check once per frame -> yield return new WaitForEndOfFrame();
        }
    }

    private void SetChoiceTo(KeyCode keyCode) {
        switch (keyCode) {
            case (KeyCode.Alpha0):
                choice = 0;
                break;
            case (KeyCode.Alpha1):
                choice = 1;
                break;
        }
        print(choice);
    }
}