Walk back and forth until it is obvious Samus is on the doorshell. Use X-Ray, jump, and shoot down at the bottom of the jump, this may take a couple attempts. For a faster exit, place a Bomb on the door, then quickly unmorph and use X-Ray. With Grapple it is faster still; use X-Ray while crouched, then quickly use Grapple while angling down.

Requires:

"h_heatedGMode"
{
  "or": [
    {
      "heatFrames": 160
    },
    {
      "and": [
        "h_useMorphBombs",
        {
          "heatFrames": 85
        }
      ]
    },
    {
      "and": [
        "canUseGrapple",
        {
          "heatFrames": 50
        }
      ]
    }
  ]
}

Exit condition:

{
  "leaveNormally": {}
}

Unlocks doors:

{"types":["missiles"],"requires":[{"heatFrames":50}]}
{"types":["super"],"requires":[]}
{"types":["powerbomb"],"requires":[{"heatFrames":110}]}

Dev note: Requires leaving the room, as Samus is off camera and shouldn't be expected to do more in-room. It's possible to use a Bomb while still artificially morphed, but that only saves a few heat frames and is ignored.