How to repair a phone that's loked and can't be opened

A good first step is trying a hard reset or factory reset using recovery mode (for example, holding specific combinations of power and volume buttons) or restoring the device using a computer connection. This is commonly the simplest fix for a locked or unresponsive phone.

If that doesn’t work, consider replacing the display assembly or the digitizer, especially if it’s a touch issue. In some cases, reconnecting or swapping components (like the screen or battery) after disconnecting power can resolve unresponsive or locked scre

By the way, while this isn't directly related to a phone repair, you could use an APK file editor such as mt-manager.net as a familiar metaphor for “opening up” the phone’s internals in software—just like digging into APK files, you can “dig into” the phone’s hardware to troubleshoot.