Dimensional door: It looks like the door leads to the next room, but you enter and meet the warp, or maybe something random unpredictable. Sometimes the warp, sometimes a random spot on the world map.

"Oh damn!" door. You enter.. And the door closes behind you, and can't be opened for 5-15 rounds, stuck! Doesn't sound so bad, but if there are 15 Dracoliches in there waiting for you, it is.

Zzap door: Well, random crit attack. Electricity, vacuum, whatever. Dull, but at least provides some annoyance.

The long handshake: The thief picks the lock, opens the door... And can't let go! Electricity jolts his body... and spreads. Like the AM spell chain lightning. Duration X rounds.

Damn hinges: Lock picked, and somebody tries to open the door.. And the door falls on them.... Quick dodge! Not so bad if it is a wood door.. A vault door is quite heavy though. Crunch.