If you have an object you want to introduce your bird to, you can put it near their cage. Put it in a place where the birds can clearly see it and leave it there for at least a few days. After a few days, try introducing it to your birds and see how they react.
Another method you can use is targeting if your birds are target trained. Simply target them again and again, each time make the bird move closer and closer to something that scares them and they will probably become less afraid of being near the object.
If your bird is looking for things to play with, you can use a few things that you might be able to find in your house or at a local store, though I think I may have told you this before
Cupcake papers or wrappers or holders. If you rip these up or cut them up, your birds might be interested in chewing them or shredding them.
Coffee filters. Similarly, your bird might like to chew/shred them.
Birds really like to chew and shred toilet paper. You can also wrap it around some treats and let your birds try to shred the paper to get a treat inside.
I should probably just make a topic about some toy making ideas that I have. I don't know about keys but keys that are used are probably dirty and I wouldn't recommend letting your bird play with them.