MTP Mount is a Mac menu-bar app. Plug in an Android phone, choose File transfer, and the phone appears in Finder under Locations. Copy, rename and delete files with Finder or the shell.
Start the free trial in the app. When you are ready, click Activate in the app: this site opens to take payment, and the app unlocks by itself. There is no account and no key to type. The licence belongs to that Mac and keeps working offline; if you reinstall, the app finds it again.
Every phone mounts read-only when it connects. To change files on it, switch the phone to Read & write in the app; it asks first, and goes back to read-only when you unplug it.