I have MX Linux setup with LUKS/btrfs and it was asking password on boot, so I put my key in TPM and modified /etc/crypttab to retrieve it, at least I don’t have to enter it at any boot, but yeah it decrypts automatically, like Windows Bitlocker in fact, it still asks my user password login (my choice, no auto login here), but at boot you can break grub and have a root shell it you know how.
Other way is to put the luks key on a USB drive, when you leave home with your computer shutdown, take the USB key with you and that’s it.