A door was a moving structure that was used to allow or block off access between spaces. They were also critical components of airlocks. They were in use by numerous civilizations and there was tremendous variety. In size they varied from designed to accommodate humanoid movement to doors blocking starships from exiting spacedocks.
Groppler Zorn of the Bandi had the entrance of his office equipped with a door made out of wood. The door was destroyed by Commander William T. Riker and Data when they forced the entry. (TNG: "Encounter at Farpoint")
When Worf and Data beamed aboard the cryonics satellite and Worf tried to pass a door but was unable because it didn't open for him. Data gave Worf a hint and pushed the door latch. (TNG: "The Neutral Zone")
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Background information Edit
Although the turbolift doors were easily operated by a members of the on set special effects department crew using a pulley (similar to common drapery pulleys), there were occasional accidents. In Star Trek: The Motion Picture, the victims of such incidents included William Shatner and Majel Barrett, both of whom were caught between doors that were closing too quickly. At times, the doors were also extraneously noisy. (The Making of Star Trek: The Motion Picture, pp. 160-161 & 183)
Destroying the Enterprise bridge for Star Trek III: The Search for Spock proved difficult because of the turbolift doors on the set, as they had been made from fiberglass. "And you don't blow up fiberglass with people nearby," noted special effects supervisor Bob Dawson. He solved this issue by reconstructing the doors with balsa wood. Dawson also fitted the explosives required for the destruction behind the doors. (The Making of the Trek Films, 3rd ed., p. 56; Trek: The Unauthorized Story of the Movies, p. 97)
According to Bill Wistrom, Douglas Grindstaff created the sound of the doors in Star Trek: The Original Series by squeeking with his tennis shoe. ("Select Historical Data Year Six - Timeless Sound Effects", TNG Season 6 DVD special feature)