A person who collects beetles is a coleopterist.
Someone who collects keys is often referred to as a "key collector." This hobby can include collecting various types of keys, such as antique, decorative, or functional keys. Additionally, the term "key enthusiast" may also be used to describe individuals who have a passion for keys and their history.
Bibliophile
A cravatologist.
collecter
a strawber.
supernatural
A key enthusiast is one way to identify them. There is no actual term to refer to someone who collects keys out of enjoyment, but if they keep the keys out of fear that they may find a use for them after throwing them away, they are potentially a compulsive hoarder.
A person who collects keys is known as a "key collector." This hobby can involve gathering various types of keys, including antique, decorative, or functional ones. Key collectors often appreciate the historical significance, craftsmanship, and design of the keys in their collections.
A car collector?
a button collector
A paper collector