@harry
you can set expiry to any Redis data types keys. below is example for Hashes

redis> HSET myhash field1 "helloworld"
(integer) 0
redis> EXPIRE myhash 60
(integer) 1
redis> TTL myhash
(integer) 51
redis> HGET myhash field1
"helloworld"
redis> TTL myhash
(integer) 10
redis> TTL myhash
(integer) -2
redis> HGET myhash field1
(nil)
Hope this helps.