Lock the Aron Kodesh

Hi,

One may not leave a Torah scroll in an unlocked, unguarded Aron Kodesh [Ark], if there is any concern that it might be stolen and/or degraded. This would not be appropriate for the honor of the Torah scroll.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 4:21:1)

Have a great day,
Mordechai