I would consider the purpose of bike locks used indoors to be:
1) A deterrent against an opportunist or common burglar.
2) To slow down a proper bike thief. An experienced bike thief can defeat any lock.
If you have space, I would get a proper bike rack big enough for all your bikes (nice to have anyway), anchor that to the ground, use a gold sold secure bicycle d-lock to lock each bike frame to the rack, then loop a thick heavy gold sold secure motorcycle chain through the whole lot and to a separate ground anchor.
These
Squire Eiger D-locks are gold sold secure bicycle rated and cheap as chips. Small shackle size so harder to fit tools in order to cut. They also require two cuts to defeat (both sides of the shackle must be cut). Easily defeated with an angle grinder though, but so is every lock.
Don't have a clue how to secure a garage door, but as for regular doors (without replacing the door), you could use a
Door Jamb reinforcement kit, and also replace all the door screws (hinges and lock strike plates) with extremely long screws , like 15cm long. Also add some
lock reinforcer plates.
You can also install your own alarm system in like an afternoon, especially if it's just for the small space your bikes are stored in. Just look on amazon for a well reviewed alarm system, buy it and install it. Maybe get one which sends you a text or phones you if it goes off.
You could also install a couple of IP cameras - these have really come down in price lately.