Hi there! I’m sorry to hear you’re having trouble opening the Carl's Jr. app. Let’s work through this together.

First, can you tell me if you receive any error messages when you try to open the app? Also, have you had a chance to restart your device? Sometimes, a simple restart can resolve app issues.

In the meantime, here are some steps you can try:

1. Check for Updates: Make sure the app is updated to the latest version. Go to the Google Play Store and see if there's an update available for the Carl's Jr. app.

2. Clear Cache: Sometimes the app's temporary data can cause problems. You can clear the cache by going to Settings > Apps > Carl's Jr. > Storage > Clear Cache.

3. Reinstall the App: If the above doesn’t work, uninstall the app and then reinstall it from the Google Play Store.

4. Check Device Compatibility: Ensure that your device meets the app's requirements, as compatibility issues can prevent it from opening.

Let me know how it goes, and if you're still having trouble, I can look up some more detailed solutions!