Why can't I sign in? [duplicate]

When I reset my password and tried to log in, it won't log in. It is just saying invalid username or password.

This really is only answerable when we know whether you have migrated your Mojang account or not. If you have, use your email instead of your username.

After resetting your password you may be forced to wait 30 minutes to 24 h hours before you can successfully sign in, as seen here.

This is most likely what is happening to you, I have personally encountered this before. If you have not already, make sure to take time to migrate your Mojang account, as it will be required for future Minecraft updates.

Hope this helps.